Set permissions for GitHub actions (#5237)

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/invalid_question.yml

@@ -3,8 +3,14 @@ on:
   schedule:
   - cron: "*/10 * * * *"
 
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     env:
       ACTIONS_STEP_DEBUG: true

.github/workflows/missing_playground.yml

@@ -3,8 +3,14 @@ on:
   schedule:
   - cron: "*/10 * * * *"
 
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     env:
       ACTIONS_STEP_DEBUG: true

.github/workflows/stale.yml

@@ -3,8 +3,14 @@ on:
   schedule:
   - cron: "0 2 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-latest
     env:
       ACTIONS_STEP_DEBUG: true

.github/workflows/tests.yml

@@ -8,6 +8,9 @@ on:
     branches-ignore:
       - 'gh-pages'
 
+permissions:
+  contents: read
+
 jobs:
   # Label of the container job
   sqlite: