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

@@ -1,6 +1,9 @@
 name: Run unit tests
 
 on: [push, pull_request]
+permissions:
+  contents: read
+
 jobs:
   lint:
     name: Check PHP syntax
@@ -42,6 +45,8 @@ jobs:
       - run: |
           git ls-files | grep \\\.php$ | grep -v ^dictionaries/scripts/* | ./vendor/bin/parallel-lint --stdin
   chunk-matrix:
+    permissions:
+      contents: none
     name: Generate Chunk Matrix
 
     runs-on: ubuntu-latest

.github/workflows/shepherd.yml

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

.github/workflows/windows-ci.yml

@@ -2,8 +2,13 @@ name: Run unit tests on Windows
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   chunk-matrix:
+    permissions:
+      contents: none
     name: Generate Chunk Matrix
 
     runs-on: ubuntu-latest