Push Docker images to Github Container Registry as well (#24101)

.github/workflows/build-image.yml

@@ -12,6 +12,7 @@ on:
       - Dockerfile
 permissions:
   contents: read
+  packages: write
 
 jobs:
   build-image:
@@ -26,15 +27,28 @@ jobs:
       - uses: hadolint/hadolint-action@v3.1.0
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
-      - uses: docker/login-action@v2
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
         if: github.event_name != 'pull_request'
+
+      - name: Log in to the Github Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+        if: github.event_name != 'pull_request'
+
       - uses: docker/metadata-action@v4
         id: meta
         with:
-          images: tootsuite/mastodon
+          images: |
+            tootsuite/mastodon
+            ghcr.io/mastodon/mastodon
           flavor: |
             latest=auto
           tags: |
@@ -42,6 +56,7 @@ jobs:
             type=pep440,pattern={{raw}}
             type=pep440,pattern=v{{major}}.{{minor}}
             type=ref,event=pr
+
       - uses: docker/build-push-action@v4
         with:
           context: .
@@ -50,5 +65,6 @@ jobs:
           builder: ${{ steps.buildx.outputs.name }}
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max