Migrate to the github container registry

.github/workflows/build.yml

@@ -14,19 +14,15 @@ jobs:
         with:
           repository: google/copybara
           ref: master
-      - name: Login to github docker registry
-        run: docker login -u $USER -p $TOKEN
-        env:
-          USER: ${{ secrets.DOCKER_HUB_USERNAME }}
-          TOKEN: ${{ secrets.DOCKER_HUB_TOKEN }}
-      - name: Build copybara docker image
-        run: |
-          docker build -t copybara .
-      - name: Tag copybara docker images
-        run: |
-          docker tag copybara anipos/copybara:latest
-          docker tag copybara anipos/copybara:$(git rev-parse HEAD)
-      - name: Push copybara docker images
-        run: |
-          docker push anipos/copybara:latest
-          docker push anipos/copybara:$(git rev-parse HEAD)
+      - id: meta
+        run: echo sha=$(git rev-parse HEAD) >> $GITHUB_OUTPUT
+      - uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.sha }},latest

README.md

@@ -5,4 +5,4 @@ actions. It should be a temporal workaround for the official image being not
 available (see https://github.com/google/copybara/issues/82).
 
 The built image is available at
-https://hub.docker.com/r/anipos/copybara.
+https://github.com/anipos/copybara-docker-image/pkgs/container/copybara-docker-image.