Update deploy.yml

Author: eugeneko

.github/workflows/deploy.yml

@@ -7,6 +7,8 @@ on:
       - 'skip-ci-**'
   # Build on pull requests, except drafts.
   pull_request:
+  # Build manually
+  workflow_dispatch:
   # Build on a schedule to keep up with the engine changes.
   schedule:
     - cron: '0 0 * * 0'