ci: run actionlint on its own config

Author: toobuntu

.github/workflows/actionlint.yml

@@ -5,9 +5,11 @@ on:
       - master
     paths:
       - '.github/workflows/*.ya?ml'
+      - '.github/actionlint.yaml'
   pull_request:
     paths:
       - '.github/workflows/*.ya?ml'
+      - '.github/actionlint.yaml'
 concurrency:
   group: "actionlint-${{ github.ref }}"
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}