Use a single command to publish CircleCI orb

This way we are not going to store the secret token on a file
of the Docker instance ran by the GitHub Action

Author: kennyadsl

publish-on-orbs-registry/entrypoint.sh

@@ -1,7 +1,4 @@
 #!/bin/sh -l
 
-# Setup using the secret CIRCLECI_TOKEN
-circleci setup --no-prompt --token $CIRCLECI_TOKEN
-
 # Publish the orb on CircleCI Orbs Registry
-circleci orb publish source.yml nebulab/feature-branch-preview@$GITHUB_REF
+circleci orb publish source.yml nebulab/feature-branch-preview@$GITHUB_REF --token $CIRCLECI_TOKEN