Add release actions for dApp examples

.github/workflows/release-auction-sponsored-txs-docker.yml

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+# This job builds and publishes a docker image for the sponsored transactions auction dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the sponsored transactions auction dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      # The versioning is of the format: `frontend_version-backend_version`.
+      - 'cis2-sponsored-transactions/*.*.*-*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-auction-sponsored-txs
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export FRONTEND_VERSION=$(jq -r .version sponsoredTransactionsAuction/frontend/package.json)
+          export BACKEND_VERSION=$(yq .package.version sponsoredTransactionsAuction/backend/Cargo.toml)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$FRONTEND_VERSION-$BACKEND_VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          file: ./sponsoredTransactionsAuction/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}

.github/workflows/release-euroe-demo-docker.yml

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+# This job builds and publishes a docker image for the euroe demo dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the euroe demo dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      - 'euroe-demo/*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-euroe-demo
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export VERSION=$(jq -r .version euroe-demo/package.json)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: ./euroe-demo
+          file: ./euroe-demo/scripts/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}

.github/workflows/release-gallery-docker.yml

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+# This job builds and publishes a docker image for the gallery dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the gallery dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      - 'gallery/*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-gallery
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export VERSION=$(jq -r .version gallery/package.json)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          file: gallery/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}

.github/workflows/release-sign-message-docker.yml

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+# This job builds and publishes a docker image for the sign message dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the sign message dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      - 'signmessage/*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-signmessage
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export VERSION=$(jq -r .version signMessage/package.json)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: ./signMessage
+          file: ./signMessage/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}

.github/workflows/release-simple-age-verification-docker.yml

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+# This job builds and publishes a docker image for the simple age verification dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the simple age verification dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      - 'simple-age-verification/*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-simple-age-verification
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export VERSION=$(jq -r .version simpleAgeVerification/package.json)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: ./simpleAgeVerification
+          file: ./simpleAgeVerification/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}

.github/workflows/release-sponsored-txs-docker.yml

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+# This job builds and publishes a docker image for the sponsored transactions dApp to
+# the dockerhub image repository.
+name: Create and publish a Docker image for the sponsored transactions dApp.
+
+on:
+  workflow_dispatch: # allows manual trigger
+
+  push:
+    tags:
+      # The versioning is of the format: `frontend_version-backend_version`.
+      - 'sponsored-transactions/*.*.*-*.*.*'
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dapp-sponsored-txs
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    environment: testnet-deployments
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      # Uses the `docker/login-action` action to log in to the Container registry.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract tag from package.json
+        id: meta
+        run: |
+          export FRONTEND_VERSION=$(jq -r .version sponsoredTransactions/frontend/package.json)
+          export BACKEND_VERSION=$(yq .package.version sponsoredTransactions/backend/Cargo.toml)
+          export FULL_IMAGE_TAG="${{ env.REGISTRY }}/concordium/$IMAGE_NAME:$FRONTEND_VERSION-$BACKEND_VERSION"
+          echo "::notice FULL_IMAGE_TAG=${FULL_IMAGE_TAG}"
+          # Make sure the image does not exist. Abort if we can retrieve any metadata.
+          if docker manifest inspect ${FULL_IMAGE_TAG} > /dev/null; then
+             echo "::error ${FULL_IMAGE_TAG} already exists"
+             exit 1
+          else
+             # Store the full image tag into a tag variable for the following step.
+             echo "tag=${FULL_IMAGE_TAG}" > "$GITHUB_OUTPUT"
+          fi
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          file: ./sponsoredTransactions/Dockerfile
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tag }}