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/@octokit/rest/plugins/authentication-deprecated/authenticate.js

@@ -0,0 +1,41 @@
+module.exports = authenticate
+
+const { Deprecation } = require('deprecation')
+const once = require('once')
+
+const deprecateAuthenticate = once((log, deprecation) => log.warn(deprecation))
+
+function authenticate (state, options) {
+  deprecateAuthenticate(state.octokit.log, new Deprecation('[@octokit/rest] octokit.authenticate() is deprecated. Use "auth" constructor option instead.'))
+
+  if (!options) {
+    state.auth = false
+    return
+  }
+
+  switch (options.type) {
+    case 'basic':
+      if (!options.username || !options.password) {
+        throw new Error('Basic authentication requires both a username and password to be set')
+      }
+      break
+
+    case 'oauth':
+      if (!options.token && !(options.key && options.secret)) {
+        throw new Error('OAuth2 authentication requires a token or key & secret to be set')
+      }
+      break
+
+    case 'token':
+    case 'app':
+      if (!options.token) {
+        throw new Error('Token authentication requires a token to be set')
+      }
+      break
+
+    default:
+      throw new Error("Invalid authentication type, must be 'basic', 'oauth', 'token' or 'app'")
+  }
+
+  state.auth = options
+}