[ci-skip] add [ci-skip] statement

Author: granny

.github/workflows/mkdocs-deploy.yml

@@ -8,6 +8,7 @@ jobs:
   build:
     name: Deploy docs
     runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[ci-skip]')"
     steps:
       - name: Checkout main
         uses: actions/checkout@v1