Add PR write permissions for automatic coverage comments

- Add pull-requests: write permission to allow action to comment on PRs
- ArtiomTr action will now automatically post coverage reports as PR comments
- Comments will include coverage summary and file-by-file breakdown

Author: Dias, Diego

.github/workflows/test-coverage.yml

@@ -11,6 +11,9 @@ on:
 jobs:
   test-coverage:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
 
     steps:
       - name: Checkout code