feat: configure slack notification on documentation change

* fix: continuous integration

.github/workflows/doc-notify.yml

@@ -1,4 +1,4 @@
-name: ci
+name: doc-notify
 
 on:
   pull_request:
@@ -19,11 +19,20 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
+          python-version: "3.12"
           cache: 'poetry'
 
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20.x"
+          cache: npm
+
       - name: install python3 environment
         run: poetry install --with build
 
       - name: notify slack channel
-        run: poetry run alfred github.notify-changes-doc --slack-webhook ${{ secrets.SLACK_WEBHOOK_DOC }}
+        run: poetry run alfred github.notify-changes-doc --slack-webhook $SLACK_WEBHOOK_DOC
+        env:
+          SLACK_WEBHOOK_DOC: ${{ secrets.SLACK_WEBHOOK_DOC }}