chore: Set permissions for GitHub actions (#3043)

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/changelog.yml

@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [opened, synchronize, labeled, unlabeled, reopened]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: Changelog Entry Check

.github/workflows/doc.yml

@@ -2,6 +2,9 @@ name: Documentation Build
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     # We want to run on external PRs, but not on our own internal PRs as they'll be run

.github/workflows/docker.yml

@@ -7,6 +7,9 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   docker:
     if: github.repository == 'psf/black'

.github/workflows/fuzz.yml

@@ -2,6 +2,9 @@ name: Fuzz
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     # We want to run on external PRs, but not on our own internal PRs as they'll be run

.github/workflows/pypi_upload.yml

@@ -4,6 +4,9 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: PyPI Upload

.github/workflows/upload_binary.yml

@@ -4,8 +4,13 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   build:
+    permissions:
+      contents: write # for actions/upload-release-asset to upload release asset
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false

.github/workflows/uvloop_test.yml

@@ -11,6 +11,9 @@ on:
       - "docs/**"
       - "*.md"
 
+permissions:
+  contents: read
+
 jobs:
   build:
     # We want to run on external PRs, but not on our own internal PRs as they'll be run