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

.github/workflows/ci.yml

@@ -28,6 +28,8 @@ jobs:
     - run: nix --experimental-features 'nix-command flakes' flake check -L
 
   check_cachix:
+    permissions:
+      contents: none
     name: Cachix secret present for installer tests
     runs-on: ubuntu-latest
     outputs:

.github/workflows/hydra_status.yml

@@ -3,6 +3,9 @@ on:
   schedule:
     - cron: "12,42 * * * *"
   workflow_dispatch:
+permissions:
+  contents: read
+
 jobs:
   check_hydra_status:
     name: Check Hydra status