Revert "Remove npm run build, since we use ncc"

This reverts commit 87ebd32.

package.json

@@ -3,6 +3,7 @@
   "description": "Extract changelog entries and add to CHANGELOG.md",
   "main": "src/main.ts",
   "scripts": {
+    "build": "tsc",
     "test": "tsc --noEmit && jest",
     "ts": "tsx ./src/main.ts"
   },