build: change build script to use ncc package from ZEIT

Author: Tristan payne

package-lock.json

@@ -5,7 +5,7 @@
   "description": "JavaScript template action",
   "main": "dist/index.js",
   "scripts": {
-    "build": "tsc",
+    "build": "ncc build ./src/main.ts -o dist/",
     "test": "jest"
   },
   "repository": {
@@ -26,6 +26,7 @@
   "devDependencies": {
     "@types/jest": "24.0.16",
     "@types/node": "12.6.9",
+    "@zeit/ncc": "^0.22.3",
     "jest": "25.2.3",
     "jest-circus": "25.2.3",
     "ts-jest": "24.0.2",