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/request-error.js

@@ -0,0 +1,39 @@
+module.exports = authenticationRequestError
+
+const { RequestError } = require('@octokit/request-error')
+
+function authenticationRequestError (state, error, options) {
+  /* istanbul ignore next */
+  if (!error.headers) throw error
+
+  const otpRequired = /required/.test(error.headers['x-github-otp'] || '')
+  // handle "2FA required" error only
+  if (error.status !== 401 || !otpRequired) {
+    throw error
+  }
+
+  if (error.status === 401 && otpRequired && error.request && error.request.headers['x-github-otp']) {
+    throw new RequestError('Invalid one-time password for two-factor authentication', 401, {
+      headers: error.headers,
+      request: options
+    })
+  }
+
+  if (typeof state.auth.on2fa !== 'function') {
+    throw new RequestError('2FA required, but options.on2fa is not a function. See https://github.com/octokit/rest.js#authentication', 401, {
+      headers: error.headers,
+      request: options
+    })
+  }
+
+  return Promise.resolve()
+    .then(() => {
+      return state.auth.on2fa()
+    })
+    .then((oneTimePassword) => {
+      const newOptions = Object.assign(options, {
+        headers: Object.assign({ 'x-github-otp': oneTimePassword }, options.headers)
+      })
+      return state.octokit.request(newOptions)
+    })
+}