chore: Set permissions for GitHub actions (#835)

Restrict the GitHub token permissions only to the required ones; this way, even if the attackers will succeed in compromising your workflow, they won’t be able to do much.

- Included permissions for the action. https://github.com/ossf/scorecard/blob/main/docs/checks.md#token-permissions

https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions

https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs

[Keeping your GitHub Actions and workflows secure Part 1: Preventing pwn requests](https://securitylab.github.com/research/github-actions-preventing-pwn-requests/)

Signed-off-by: naveensrinivasan <[email protected]>

Author: naveensrinivasan

.github/workflows/pr.yml

@@ -5,8 +5,14 @@ on:
       - opened
       - edited
       - synchronize
+permissions:
+  contents: read
+
 jobs:
   main:
+    permissions:
+      pull-requests: read  # for amannn/action-semantic-pull-request to analyze PRs
+      statuses: write  # for amannn/action-semantic-pull-request to mark status of analyzed PR
     name: Check PR title
     runs-on: ubuntu-latest
     steps: