Add auth support (#21)

* Updates

* Update

* Update

* Update

* Update

* Yarn sometimes prefers npmrc, so use same token

* Description

* Update readme

* Feedback

* Add type

* new toolkit and scoped registries

* npmrc in RUNNER_TEMP

* Dont always auth

* Try exporting blank token

* Get auth working for now pending runner changes

* Fix string interpolation for auth token.

* Don't export both userconfigs

* Update authutil.js

* Add single quotes for authString

* Fix the registry string.

* Use userconfig and append trailing slash

* Keep in root of repo

* Try just adding auth token

* Remove auth token

* Try changes again

* Add tests

* Npm and GPR samples

* Add types

node_modules/path-key/package.json

@@ -0,0 +1,76 @@
+{
+  "_args": [
+    [
+      "path-key@2.0.1",
+      "C:\\Users\\Administrator\\Documents\\setup-node"
+    ]
+  ],
+  "_development": true,
+  "_from": "path-key@2.0.1",
+  "_id": "path-key@2.0.1",
+  "_inBundle": false,
+  "_integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=",
+  "_location": "/path-key",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "version",
+    "registry": true,
+    "raw": "path-key@2.0.1",
+    "name": "path-key",
+    "escapedName": "path-key",
+    "rawSpec": "2.0.1",
+    "saveSpec": null,
+    "fetchSpec": "2.0.1"
+  },
+  "_requiredBy": [
+    "/cross-spawn",
+    "/npm-run-path"
+  ],
+  "_resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
+  "_spec": "2.0.1",
+  "_where": "C:\\Users\\Administrator\\Documents\\setup-node",
+  "author": {
+    "name": "Sindre Sorhus",
+    "email": "sindresorhus@gmail.com",
+    "url": "sindresorhus.com"
+  },
+  "bugs": {
+    "url": "https://github.com/sindresorhus/path-key/issues"
+  },
+  "description": "Get the PATH environment variable key cross-platform",
+  "devDependencies": {
+    "ava": "*",
+    "xo": "*"
+  },
+  "engines": {
+    "node": ">=4"
+  },
+  "files": [
+    "index.js"
+  ],
+  "homepage": "https://github.com/sindresorhus/path-key#readme",
+  "keywords": [
+    "path",
+    "key",
+    "environment",
+    "env",
+    "variable",
+    "var",
+    "get",
+    "cross-platform",
+    "windows"
+  ],
+  "license": "MIT",
+  "name": "path-key",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/sindresorhus/path-key.git"
+  },
+  "scripts": {
+    "test": "xo && ava"
+  },
+  "version": "2.0.1",
+  "xo": {
+    "esnext": true
+  }
+}