@actions/github v3 using Octokit/core (#453)

* Rebuild to use @Octokit/Core

packages/github/src/internal/utils.ts

@@ -0,0 +1,25 @@
+import * as http from 'http'
+import * as httpClient from '@actions/http-client'
+import {OctokitOptions} from '@octokit/core/dist-types/types'
+
+export function getAuthString(
+  token: string,
+  options: OctokitOptions
+): string | undefined {
+  if (!token && !options.auth) {
+    throw new Error('Parameter token or opts.auth is required')
+  } else if (token && options.auth) {
+    throw new Error('Parameters token and opts.auth may not both be specified')
+  }
+
+  return typeof options.auth === 'string' ? options.auth : `token ${token}`
+}
+
+export function getProxyAgent(destinationUrl: string): http.Agent {
+  const hc = new httpClient.HttpClient()
+  return hc.getAgent(destinationUrl)
+}
+
+export function getApiBaseUrl(): string {
+  return process.env['GITHUB_API_URL'] || 'https://api.github.com'
+}