feat: build for arm and x86 at the same time

.github/workflows/build-test-image.yml

@@ -1,5 +1,6 @@
 name: Build Test Image
 on:
+  workflow_dispatch: {}
   push:
     branches:
       - master
@@ -9,7 +10,7 @@ on:
 
 jobs:
   build:
-#    runs-on: ubuntu-latest
+    #    runs-on: ubuntu-latest
     runs-on: self-hosted
     strategy:
       matrix:
@@ -37,9 +38,10 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: markusqvestseidl/keycloak-dev:${{ matrix.keycloak-version }}
           file: test/Dockerfile
           build-args: |