Correctly interpolate GITHUB_REF env variable

Author: kennyadsl

publish-on-orbs-registry/entrypoint.sh

@@ -1,4 +1,4 @@
 #!/bin/sh -l
 
 # Publish the orb on CircleCI Orbs Registry
-circleci orb publish source.yml nebulab/feature-branch-preview@$GITHUB_REF --token $CIRCLECI_TOKEN
+circleci orb publish source.yml "nebulab/feature-branch-preview@${GITHUB_REF}" --token $CIRCLECI_TOKEN