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/build.yml

@@ -165,6 +165,8 @@ jobs:
         continue-on-error: true
 
   macOS:
+    permissions:
+      contents: none
     runs-on: macos-10.15
     needs: Fetch-Source
     strategy:

.github/workflows/check.yml

@@ -21,6 +21,9 @@ concurrency:
   group: check-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   check:
     runs-on: ubuntu-18.04

.github/workflows/doc.yml

@@ -19,6 +19,9 @@ concurrency:
   group: docs-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   build-html:
     runs-on: ubuntu-latest

.github/workflows/docker_linux.yml

@@ -34,6 +34,9 @@ concurrency:
   group: docker-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   # Push image to GitHub Packages.
   push:

.github/workflows/lint.yml

@@ -6,8 +6,14 @@ concurrency:
   group: lint-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   lint:
+    permissions:
+      contents: read  # for actions/checkout to fetch code
+      statuses: write  # for github/super-linter to mark status of each linter run
     name: Lint
     runs-on: ubuntu-latest
     steps: