Minimize GHA permissions

Set the GitHub Actions token permission to null in most workflows.

This results in:

GITHUB_TOKEN Permissions
  Metadata: read

The default permissions, used without the null override, are either

GITHUB_TOKEN Permissions
  Actions: write
  Checks: write
  Contents: write
  Deployments: write
  Discussions: write
  Issues: write
  Metadata: read
  Packages: write
  Pages: write
  PullRequests: write
  RepositoryProjects: write
  SecurityEvents: write
  Statuses: write

or

GITHUB_TOKEN Permissions
  Actions: read
  Checks: read
  Contents: read
  Deployments: read
  Discussions: read
  Issues: read
  Metadata: read
  Packages: read
  Pages: read
  PullRequests: read
  RepositoryProjects: read
  SecurityEvents: read
  Statuses: read

Jobs triggered by PRs get read permissions, other jobs get write.

A few jobs require non-null permissions to function.

The dependent issues GHA needs PR/issues write permissions to add/remove
`dependent` labels. It needs status write permission to block/unblock
PRs when dependencies are missing/met. Fails with HttpError otherwise.

The release job needs permissions to publish releases on GitHub and
create/edit PRs. The exact permissions for this job might need tweaking.

The testing workflow already had specific permissions granted.

Signed-off-by: Daniel Farrell <[email protected]>

.github/workflows/branch.yml

@@ -4,6 +4,8 @@ name: Branch Checks
 on:
   pull_request:
 
+permissions: {}
+
 jobs:
   target_branch:
     name: PR targets branch

.github/workflows/codeowners.yml

@@ -7,6 +7,8 @@ on:
       - 'CODEOWNERS'
       - 'CODEOWNERS.in'
 
+permissions: {}
+
 jobs:
   updated:
     name: Up-to-date

.github/workflows/dependent-issues.yml

@@ -19,6 +19,11 @@ on:
   schedule:
     - cron: '0 0/6 * * *'  # every 6 hours
 
+permissions:
+  issues: write
+  pull-requests: write
+  statuses: write
+
 jobs:
   check:
     name: Check Dependencies

.github/workflows/e2e.yml

@@ -4,6 +4,8 @@ name: End to End Tests
 on:
   pull_request:
 
+permissions: {}
+
 jobs:
   e2e:
     name: E2E

.github/workflows/linting.yml

@@ -4,6 +4,8 @@ name: Linting
 on:
   pull_request:
 
+permissions: {}
+
 jobs:
   apply-suggestions-commits:
     name: 'No "Apply suggestions from code review" Commits'

.github/workflows/periodic.yml

@@ -5,6 +5,8 @@ on:
   schedule:
     - cron: "0 0 * * 0"
 
+permissions: {}
+
 jobs:
   markdown-link-check-periodic:
     name: Markdown Links (all files)

.github/workflows/release.yml

@@ -8,6 +8,12 @@ on:
     paths:
       - 'releases/**'
 
+permissions:
+  contents: write
+  packages: write
+  pull-requests: write
+  issues: write
+
 jobs:
   release:
     name: Release

.github/workflows/validation.yml

@@ -4,6 +4,8 @@ name: Validation
 on:
   pull_request:
 
+permissions: {}
+
 jobs:
   yamls:
     name: Release YAMLs