Use multiplatform build

Author: Anze

.github/workflows/on_release.yml

@@ -13,6 +13,16 @@ jobs:
     - name: Checkout source code
       uses: actions/checkout@v1
 
+    - name: Set up QEMU for more platforms
+      uses: docker/setup-qemu-action@v1
+      with:
+        platforms: all
+
+    - name: Set docker build as alias to buildx (multiarch build)
+      uses: docker/setup-buildx-action@v1
+      id: buildx
+      with:
+        install: true
 
     - name: Deploy to Docker Hub
       if: success() && startsWith(github.ref, 'refs/tags/v')
@@ -22,13 +32,16 @@ jobs:
         DOCKER_IMAGE: grafolean/grafolean-snmp-bot
         DOCKER_USER: grafolean
         DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        BUILD_PLATFORMS: linux/amd64,linux/arm/v7
       run: |
+        echo "Available plaftorms: ${{ steps.buildx.outputs.platforms }}"
+        echo "Building for plaftorms: $BUILD_PLATFORMS"
         export VERSION=${GITHUB_REF_TAG:10:50}
         echo "Version is $VERSION"
         export LAST_KNOWN_VERSION=`git tag -l --sort=-version:refname "v*.*.*" | grep -v rc | head -n 1 | tr -d '[:space:]'`
         echo "Last known version is $LAST_KNOWN_VERSION"
         docker login -u $DOCKER_USER -p $DOCKER_PASSWORD $DOCKER_REGISTRY
-        docker build -t "docker.io/$DOCKER_IMAGE:$VERSION" -t "docker.io/$DOCKER_IMAGE:latest" --build-arg VERSION=$VERSION --build-arg VCS_REF=$GITHUB_SHA --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') .
+        docker build --platform "$BUILD_PLATFORMS" -t "docker.io/$DOCKER_IMAGE:$VERSION" -t "docker.io/$DOCKER_IMAGE:latest" --build-arg VERSION=$VERSION --build-arg VCS_REF=$GITHUB_SHA --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') .
         [ "$LAST_KNOWN_VERSION" == "$VERSION" ] && docker tag "docker.io/$DOCKER_IMAGE:$VERSION" "docker.io/$DOCKER_IMAGE:latest" || echo "NOT MARKING AS LATEST!"
         docker images
         docker push "docker.io/$DOCKER_IMAGE:$VERSION"