update: use docker action to push

.github/workflows/docker-publish.yml

@@ -16,7 +16,7 @@ on:
 env:
   # TODO: Change variable to your image's name.
   IMAGE_NAME: relayman
-
+  REGISTRY: https://ghcr.io
 jobs:
   # Run tests.
   # See also https://docs.docker.com/docker-hub/builds/automated-testing/
@@ -49,22 +49,17 @@ jobs:
       - name: Build image
         run: docker build . --file Dockerfile --tag $IMAGE_NAME
 
-      - name: Log into GitHub Container Registry
-        # TODO: Create a PAT with `read:packages` and `write:packages` scopes and save it as an Actions secret `CR_PAT`
-        run: echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u ${{ github.actor }} --password-stdin
-
-      - name: Push image to GitHub Container Registry
-        run: |
-          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
-          # Change all uppercase to lowercase
-          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
-          # Strip git ref prefix from version
-          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
-          # Strip "v" prefix from tag name
-          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
-          # Use Docker `latest` tag convention
-          [ "$VERSION" == "master" ] && VERSION=latest
-          echo IMAGE_ID=$IMAGE_ID
-          echo VERSION=$VERSION
-          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
-          docker push $IMAGE_ID:$VERSION
+      - name: Log in to the GitHub Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: $IMAGE_NAME
+          labels: $IMAGE_NAME