add deployment issue guidance to posix hook

Author: KanchanN-Microsoft

azure.yaml

@@ -63,6 +63,16 @@ hooks:
         Write-Host ""
       shell: pwsh
       interactive: true
+    posix:
+      run: |
+        echo ""
+        echo "  ---------------------------------------------------------------------------------------------------"
+        echo "  Note: If deployment fails or you encounter an issue, please open an issue with the deployment logs."
+        echo "  https://github.com/microsoft/content-generation-solution-accelerator/issues"
+        echo "  ---------------------------------------------------------------------------------------------------"
+        echo ""
+      shell: sh
+      interactive: true
   postprovision:
     windows:
       run: |