chore: set permissions for GitHub actions (#4947)

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: neilnaveen <42328488+neilnaveen@users.noreply.github.com>

.github/workflows/commenter.yml

@@ -2,8 +2,13 @@ name: Commenter
 
 on: [pull_request_target]
 
+permissions:
+  contents: read
+
 jobs:
   commenter:
+    permissions:
+      pull-requests: write  # for marocchino/sticky-pull-request-comment to create or update PR comment
     runs-on: ubuntu-latest
     steps:
       - name: Comment PR

.github/workflows/linter.yml

@@ -2,6 +2,9 @@ name: Linter
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   linter:
     runs-on: ubuntu-latest

.github/workflows/release-drafter.yml

@@ -5,8 +5,14 @@ on:
     branches:
       - master
 
+permissions:
+  contents: read
+
 jobs:
   update_release_draft:
+    permissions:
+      contents: write  # for release-drafter/release-drafter to create a github release
+      pull-requests: write  # for release-drafter/release-drafter to add label to PR
     runs-on: ubuntu-latest
     steps:
       - uses: release-drafter/release-drafter@v5

.github/workflows/tester.yml

@@ -2,6 +2,9 @@ name: Tester
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   tester:
     runs-on: ${{ matrix.os }}
@@ -23,6 +26,9 @@ jobs:
         env:
           CI: true
   coverage:
+    permissions:
+      checks: write  # for coverallsapp/github-action to create new checks
+      contents: read  # for actions/checkout to fetch code
     runs-on: ${{ matrix.os }}
     strategy:
       matrix: