Build multiple platforms

.github/workflows/docker-image.yml

@@ -9,29 +9,56 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      -
-        name: Set up Docker Buildx
+      - name: Prepare
+        id: prep
+        run: |
+          DOCKER_IMAGE=${{ secrets.DOCKERHUB_USERNAME }}/${GITHUB_REPOSITORY#*/}
+          VERSION=latest
+          SHORTREF=${GITHUB_SHA::8}
+
+          # If this is git tag, use the tag name as a docker tag
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${SHORTREF}"
+
+          # If the VERSION looks like a version number, assume that
+          # this is the most recent version of the image and also
+          # tag it 'latest'.
+          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
+          fi
+
+          # Set output parameters.
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=docker_image::${DOCKER_IMAGE}
+      - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
-      -
-        name: Login to DockerHub
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@master
+      - name: Login to DockerHub
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Build and push
+      - name: Build and push
         id: docker_build
         uses: docker/build-push-action@v2
         with:
+          builder: ${{ steps.buildx.outputs.name }}
           push: true
-          tags: tedkulp/vidgrab:latest
+          tags: ${{ steps.prep.outputs.tags }}
+          platforms: linux/amd64,linux/arm64,linux/ppc64le
           cache-from: type=registry,ref=tedkulp/vidgrab:latest
           cache-to: type=inline
-      -
-        name: git checkout
+      - name: git checkout
         uses: actions/checkout@v2
-      -
-        name: push README to Dockerhub
+      - name: push README to Dockerhub
         uses: christian-korneck/update-container-description-action@v1
         env:
           DOCKER_USER: ${{ secrets.DOCKERHUB_USERNAME }}