Add environment variable for App Insights connection

Author: webmaxru

.github/workflows/deploy-pages.yml

@@ -36,6 +36,8 @@ jobs:
           python-version: "3.12"
 
       - name: Regenerate site from content
+        env:
+          APPINSIGHTS_CONNECTION_STRING: ${{ vars.APPINSIGHTS_CONNECTION_STRING }}
         run: |
           python -m pip install --upgrade pip
           python -m pip install pyyaml