rename file to be consistent

action.yaml

@@ -2,7 +2,7 @@ name: Docker Tag
 description: Tags an existing container manifest in a remote registry without pulling/pushing any images
 runs:
   using: node16
-  main: dist/main.js
+  main: dist/index.js
 inputs:
   registry:
     description: URL to the container registry

package.json

@@ -2,7 +2,7 @@
 	"private": true,
 	"scripts": {
 	  "lint": "eslint .",
-	  "prepare": "ncc build main.js -o dist --source-map --license licenses.txt",
+	  "prepare": "ncc build index.js -o dist --source-map --license licenses.txt",
 	  "all": "npm run lint && npm run prepare"
 	},
 	"dependencies": {