Resolve "Double pipeline triggered if merge request has melodic-* branch name."

Closes #45 (closed)

ci-templates/auto-rules/no-default.yml

@@ -2,6 +2,8 @@ include: ci-templates/core.yml
 
 workflow:
   rules:
+    - if: $CI_MERGE_REQUEST_IID
+      when: never
     - if: $CI_COMMIT_REF_NAME =~ /^kinetic-.*/
       variables:
         DEFAULT_DISTRO: "kinetic"