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: nathannaveen <42319948+nathannaveen@users.noreply.github.com>

.github/workflows/build_test.yml

@@ -1,5 +1,8 @@
 on: [push, pull_request]
 name: Build Test
+permissions:
+  contents: read
+
 jobs:
   build_test_v3:
     strategy:

.github/workflows/labeler.yml

@@ -2,8 +2,14 @@ name: "Pull Request Labeler"
 on:
 - pull_request_target
 
+permissions:
+  contents: read
+
 jobs:
   triage:
+    permissions:
+      contents: read  # for actions/labeler to determine modified files
+      pull-requests: write  # for actions/labeler to add labels to PRs
     runs-on: ubuntu-latest
     steps:
     - uses: actions/labeler@v4

.github/workflows/lint.yml

@@ -4,8 +4,14 @@ on:
   push:
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   golangci:
+    permissions:
+      contents: read  # for actions/checkout to fetch code
+      pull-requests: read  # for golangci/golangci-lint-action to fetch pull requests
     name: lint
     runs-on: ubuntu-latest
     steps:

.github/workflows/release.yml

@@ -3,6 +3,9 @@ on:
     - cron:  '0 1 1 * *'  # UTC 01:00 on the first day of the Month
 
 name: Release
+permissions:
+  contents: read
+
 jobs:
   release:
     runs-on: ubuntu-latest

.github/workflows/shellcheck.yml

@@ -1,5 +1,8 @@
 on: [push, pull_request]
 name: Shellcheck
+permissions:
+  contents: read
+
 jobs:
   shellcheck:
     name: Shellcheck

.github/workflows/test.yml

@@ -1,5 +1,8 @@
 on: [push, pull_request]
 name: Test
+permissions:
+  contents: read
+
 jobs:
   test_v3_module:
     strategy: