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/before-request.js

@@ -0,0 +1,40 @@
+module.exports = authenticationBeforeRequest
+
+const btoa = require('btoa-lite')
+const uniq = require('lodash.uniq')
+
+function authenticationBeforeRequest (state, options) {
+  if (!state.auth.type) {
+    return
+  }
+
+  if (state.auth.type === 'basic') {
+    const hash = btoa(`${state.auth.username}:${state.auth.password}`)
+    options.headers['authorization'] = `Basic ${hash}`
+    return
+  }
+
+  if (state.auth.type === 'token') {
+    options.headers['authorization'] = `token ${state.auth.token}`
+    return
+  }
+
+  if (state.auth.type === 'app') {
+    options.headers['authorization'] = `Bearer ${state.auth.token}`
+    const acceptHeaders = options.headers['accept'].split(',')
+      .concat('application/vnd.github.machine-man-preview+json')
+    options.headers['accept'] = uniq(acceptHeaders).filter(Boolean).join(',')
+    return
+  }
+
+  options.url += options.url.indexOf('?') === -1 ? '?' : '&'
+
+  if (state.auth.token) {
+    options.url += `access_token=${encodeURIComponent(state.auth.token)}`
+    return
+  }
+
+  const key = encodeURIComponent(state.auth.key)
+  const secret = encodeURIComponent(state.auth.secret)
+  options.url += `client_id=${key}&client_secret=${secret}`
+}