Configure criteria for triggering the NPM publish (#23)

- allow to trigger NPM publish manually
- auto publish to NPM only in case changes in `package.json` or `index.js`

Author: aivus

.github/workflows/publish.yml

@@ -1,9 +1,13 @@
 name: Publish to npm
 
 on:
+  workflow_dispatch: ~
   push:
     branches:
       - main
+    paths:
+      - 'package.json'
+      - 'index.js'  
 
 permissions:
   contents: write