Set permissions for GitHub actions (#5470)

- 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/)

 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.

Signed-off-by: naveensrinivasan <172697+naveensrinivasan@users.noreply.github.com>

.github/workflows/ajson_mirror.yaml

@@ -5,9 +5,15 @@ on:
   schedule:
     - cron: '0 0 * * 1'
 
+permissions:
+  contents: read
+
 jobs:
   pr_ajson_changes:
     # Origin repo only
+    permissions:
+      contents: write  # for peter-evans/create-pull-request to create branch
+      pull-requests: write  # for peter-evans/create-pull-request to create a PR
     if: github.repository == 'abapGit/abapGit'
 
     runs-on: ubuntu-latest

.github/workflows/test.yml

@@ -3,6 +3,9 @@ name: test
 on:
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest