feat: remove resource_group (concurrency limiting)

Now that we build with unique tags, there shouldn't be any cross talk anymore.

.gitlab-ci.yml

@@ -165,7 +165,6 @@ version:
   extends: .docker 
   rules:
     - when: on_success
-  resource_group: ${CI_COMMIT_REF_NAME}-${VERSION}
   tags:
     - docker-new
   before_script: