Add CI pipeline + dependabot

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/build.yaml

@@ -0,0 +1,38 @@
+name: Build
+on: [push]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      - name: Get tag or branch
+        id: get_tag_or_branch
+        run: |
+          if echo $GITHUB_REF | grep -Eq '^refs\/tags\/.*'; then
+              echo ::set-output name=TAG_OR_BRANCH::${GITHUB_REF#refs/tags/}
+          else
+              echo ::set-output name=TAG_OR_BRANCH::${GITHUB_REF#refs/heads/}
+          fi
+      - name: Gradle test
+        if: github.ref != 'refs/heads/master' && ! startsWith(github.ref, 'refs/tags')
+        env:
+          GRADLE_CLI_OPTS: "-Dversion=${{steps.get_tag_or_branch.outputs.TAG_OR_BRANCH}} -Pvaadin.productionMode=true -Dquarkus.container-image.builder=docker"
+        run: "chmod +x ./gradlew && ./gradlew ${GRADLE_CLI_OPTS} build"
+      - name: Login to DockerHub
+        if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags')
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and push Docker images
+        if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags')
+        env:
+          TAG_OR_BRANCH: ${{steps.get_tag_or_branch.outputs.TAG_OR_BRANCH}}
+          GRADLE_CLI_OPTS: "-Dquarkus.container-image.tag=${{steps.get_tag_or_branch.outputs.TAG_OR_BRANCH}} -Dversion=${{steps.get_tag_or_branch.outputs.TAG_OR_BRANCH}} -Pvaadin.productionMode=true -Dquarkus.container-image.push=true -Dquarkus.container-image.build=true -Dquarkus.container-image.builder=docker -Dquarkus.container-image.group=faforever"
+        run: "chmod +x ./gradlew && ./gradlew ${GRADLE_CLI_OPTS} build"