feat: Add tag_with_latest option for tagging with latest additionally

When skipping the push on unchanged digests, it's not enough to push the current tag,
which is probably semver, we also need to push the latest, so we can later check if
the latest digest equals the currently built image

action.yml

@@ -48,6 +48,9 @@ inputs:
   skip_unchanged_digest:
     description: "Avoids pushing the image if the build generated the same digest"
     required: false
+  tag_with_latest:
+    description: "Tags the built image with additional latest tag"
+    required: false
 runs:
   using: "docker"
   image: "Dockerfile"