chore: Set permissions for GitHub actions (#2168)

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 <172697+naveensrinivasan@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -5,6 +5,9 @@ on:
   pull_request:
     types: [ assigned, opened, synchronize, reopened, labeled ]
 name: ci
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest

.github/workflows/release-please.yml

@@ -3,8 +3,13 @@ on:
      branches:
        - main
 name: release-please
+permissions:
+  contents: read
+
 jobs:
   release-please:
+    permissions:
+      contents: write  # for google-github-actions/release-please-action to create release PR's and commit message
     runs-on: ubuntu-latest
     steps:
       - uses: google-github-actions/release-please-action@v3