Build multiarch image

.github/workflows/docker-publish.yml

@@ -13,9 +13,6 @@ on:
   # Run tests for any PRs.
   pull_request:
 
-env:
-  IMAGE_NAME: icons
-
 jobs:
   # Run tests.
   # See also https://docs.docker.com/docker-hub/builds/automated-testing/
@@ -45,16 +42,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-
-      - name: Build image
-        run: docker build . --file Dockerfile --tag $IMAGE_NAME
-
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log into registry
         run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
-
-      - name: Push image
+      - name: Generate image name
         run: |
-          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
+          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/icons
 
           # Change all uppercase to lowercase
           IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
@@ -71,5 +67,14 @@ jobs:
           echo IMAGE_ID=$IMAGE_ID
           echo VERSION=$VERSION
 
-          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
-          docker push $IMAGE_ID:$VERSION
+          echo "IMAGE_NAME=$IMAGE_ID:$VERSION" >> $GITHUB_ENV
+      - name: Build image
+        run: |
+          docker buildx build \
+            --file Dockerfile \
+            --tag $IMAGE_NAME \
+            --platform=linux/amd64,linux/arm64 \
+            --output=type=image,push=true \
+            .
+
+