Added workflow_dispatch trigger for CI to enable manual run

.github/workflows/CI.yaml

@@ -3,6 +3,7 @@ name: CI
 on:
   # GitHub has started calling new repo's first branch "main" https://github.com/github/renaming
   # The cookiecutter uses the "--initial-branch" flag when it runs git-init
+  workflow_dispatch:
   push:
     branches:
       - "main"