Add "build-npm" script

bexnoss · bexnoss · commit caaff0532d75 · 2022-02-23T09:53:44.000+01:00
This script can be used to build @actions/setup-python when it was
installed as a dependency in another action.

Add dependency:
`npm install actions/setup-python#v2`

Automatically build on install:
```
"scripts": {
  "postinstall": "npm run build-npm --prefix node_modules/setup-python"
}
```

Install depending action as usual:
`npm ci` or `npm install`

No further steps necessary, @actions/setup-python is built automatically
in the "postinstall" step of installation.
diff --git a/package.json b/package.json
@@ -6,6 +6,7 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "ncc build -o dist/setup src/setup-python.ts && ncc build -o dist/cache-save src/cache-save.ts",
+    "build-npm": "npm ci && node -e \"try{require('fs').rmdirSync('lib',{recursive:true})}catch(e){}\" && tsc --declaration --declarationMap",
     "format": "prettier --write \"{,!(node_modules)/**/}*.ts\"",
     "format-check": "prettier --check \"{,!(node_modules)/**/}*.ts\"",
     "release": "ncc build -o dist/setup src/setup-python.ts && ncc build -o dist/cache-save src/cache-save.ts && git add -f dist/",
