Move slack_notify action to Daily workflow

Author: yasulab

.github/workflows/deploy_to_pages.yml

@@ -48,9 +48,3 @@ jobs:
       with:
         personal_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir:    ./_site
-
-    - name: 🔔 Notify error to Slack
-      if:   github.ref == 'refs/heads/main' && job.status != 'success'
-      uses: yasslab/slack_notify@main
-      with:
-        slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}

.github/workflows/scheduler_daily.yml

@@ -95,3 +95,9 @@ jobs:
       with:
         personal_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir:    ./_site
+
+    - name: 🔔 Notify error to Slack (if any)
+      if:   github.ref == 'refs/heads/main' && job.status != 'success'
+      uses: yasslab/slack_notify@main
+      with:
+        slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}