ci: explicit permissions on actions (#199)

Author: doublethink

.github/workflows/ci.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   test:
     name: Test / OS ${{ matrix.os }} / Python ${{ matrix.python-version }}

.github/workflows/conventional-commits.yml

@@ -16,6 +16,9 @@ on:
       - reopened
       - ready_for_review
 
+permissions:
+  contents: read
+
 jobs:
   check-conventional-commits:
     runs-on: ubuntu-latest

.github/workflows/stale.yml

@@ -4,6 +4,11 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+
 jobs:
   mark_stale:
     name: Mark issues and PRs as Stale