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/with-authorization-prefix.js

@@ -0,0 +1,23 @@
+module.exports = withAuthorizationPrefix
+
+const atob = require('atob-lite')
+
+const REGEX_IS_BASIC_AUTH = /^[\w-]+:/
+
+function withAuthorizationPrefix (authorization) {
+  if (/^(basic|bearer|token) /i.test(authorization)) {
+    return authorization
+  }
+
+  try {
+    if (REGEX_IS_BASIC_AUTH.test(atob(authorization))) {
+      return `basic ${authorization}`
+    }
+  } catch (error) { }
+
+  if (authorization.split(/\./).length === 3) {
+    return `bearer ${authorization}`
+  }
+
+  return `token ${authorization}`
+}