add manual workflow_dispatch job for publish workflow

Author: alexluckett

.github/workflows/publish.yml

@@ -1,6 +1,8 @@
 name: Publish Engine plugin
 
 on:
+  workflow_dispatch: {}
+
   push:
     branches:
       - main
@@ -9,7 +11,6 @@ on:
       - 'babel.config.*'
       - 'src/**'
       - '!**/*.test.*'
-      - '.github/workflows'
 
 concurrency:
   group: publish-engine-plugin