chore(cicd): fix trigger for gh actions linting andctesting PR from fork (#464)

Author: flochaz

.github/workflows/on-push.yml renamed to .github/workflows/pr_lint_and_test.yml

@@ -1,9 +1,7 @@
-name: on-push-event
+name: pr-lint-and-test
 on:
-  push:
-    branches:    
-          - '**'        # matches every branch
-          - '!main' 
+  pull_request:
+    types: [opened, synchronize]
 jobs:
   on_push:
     runs-on: ubuntu-latest
@@ -45,4 +43,4 @@ jobs:
         uses: romeovs/lcov-reporter-action@v0.3.1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          lcov-file: ./coverage/lcov.info
+          lcov-file: ./coverage/lcov.info