Exclude qa and docs from Rails 4 builds

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54059

.gitlab-ci.yml

@@ -79,6 +79,8 @@ stages:
   allow_failure: false
   except:
     variables:
+      - $CI_COMMIT_REF_NAME =~ /(^docs[\/-].*|.*-docs$)/
+      - $CI_COMMIT_REF_NAME =~ /(^qa[\/-].*|.*-qa$)/
       - $CI_COMMIT_REF_NAME =~ /norails4/
       - $RAILS5_DISABLED
   variables: