docs: use poac-bot for commit

Author: ken-matsui

.github/workflows/docs.yml

@@ -39,5 +39,10 @@ jobs:
       - name: Install mkdocs
         run: pip install mkdocs
 
+      - name: Setup Git
+        run: |
+          git config --global user.name 'poac-bot'
+          git config --global user.email '[email protected]'
+
       - name: Publish docs
         run: mkdocs gh-deploy --no-history