ci: [StepSecurity] Harden GitHub Actions (#4954)

Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>

.github/workflows/codeql.yml

@@ -30,8 +30,14 @@ on:
   schedule:
     - cron: '17 9 * * 5'
 
+permissions:
+  contents: read
+
 jobs:
   changes:
+    permissions:
+      contents: read  # for dorny/paths-filter to fetch a list of changed files
+      pull-requests: read  # for dorny/paths-filter to read pull requests
     outputs:
       should-run-analyze: ${{ steps.changes.outputs.src == 'true' }}
     if: github.event.pull_request.draft == false

.github/workflows/labeler.yml

@@ -8,6 +8,9 @@ on:
       - synchronize
       - ready_for_review
 
+permissions:
+  contents: read
+
 jobs:
   triage:
     permissions:

.github/workflows/pr-size-labeler.yml

@@ -2,8 +2,13 @@ name: pr-size
 
 on: [pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   labeler:
+    permissions:
+      pull-requests: write  # for codelytv/pr-size-labeler to add labels & comment on PRs
     runs-on: ubuntu-latest
     name: Label the PR size
     steps:

.github/workflows/renovate-config.yml

@@ -12,6 +12,9 @@ on:
       - '.github/renovate.json5'
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   validate:
     runs-on: ubuntu-24.04

.github/workflows/stale.yml

@@ -2,8 +2,14 @@ name: Close Stale PRs
 on:
   schedule:
     - cron: '30 1 * * *'
+permissions:
+  contents: read
+
 jobs:
   stale:
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9

.github/workflows/test.yml

@@ -19,8 +19,14 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   changes:
+    permissions:
+      contents: read  # for dorny/paths-filter to fetch a list of changed files
+      pull-requests: read  # for dorny/paths-filter to read pull requests
     outputs:
       should-run-tests: ${{ steps.changes.outputs.go == 'true' }}
     if: github.event.pull_request.draft == false

.github/workflows/testing-env-image.yml

@@ -15,8 +15,14 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   changes:
+    permissions:
+      contents: read  # for dorny/paths-filter to fetch a list of changed files
+      pull-requests: read  # for dorny/paths-filter to read pull requests
     outputs:
       should-run-build: ${{ steps.changes.outputs.src == 'true' }}
     if: github.event.pull_request.draft == false