chore: Set permissions for GitHub actions

 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: naveen <[email protected]>

Author: naveensrinivasan

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ name: CI
 env:
   COMPOSER_ROOT_VERSION: "8.5-dev"
 
+permissions:
+  contents: read
+
 jobs:
   coding-guidelines:
     name: Coding Guidelines