Add action to warn against PR against master (should be develop)

.github/workflows/master_branch_pr.yml

@@ -1,6 +1,5 @@
 on:
   pull_request:
-  pull_request_target:
     branches: [master]
 
 jobs:
@@ -8,7 +7,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Post PR comment
-        if: failure()
         uses: mshick/add-pr-comment@v1
         with:
           message: |