attempt to add latest docker tag

.github/workflows/docker-publish.yml

@@ -79,6 +79,8 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          flavor: |
+            latest=auto
 
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action