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

* Rebuild to use @Octokit/Core

packages/github/src/utils.ts

@@ -0,0 +1,44 @@
+import * as Context from './context'
+import * as Utils from './internal/utils'
+
+// octokit + plugins
+import {Octokit} from '@octokit/core'
+import {OctokitOptions} from '@octokit/core/dist-types/types'
+import {restEndpointMethods} from '@octokit/plugin-rest-endpoint-methods'
+import {paginateRest} from '@octokit/plugin-paginate-rest'
+
+export const context = new Context.Context()
+
+const baseUrl = Utils.getApiBaseUrl()
+const defaults = {
+  baseUrl,
+  request: {
+    agent: Utils.getProxyAgent(baseUrl)
+  }
+}
+
+export const GitHub = Octokit.plugin(
+  restEndpointMethods,
+  paginateRest
+).defaults(defaults)
+
+/**
+ * Convience function to correctly format Octokit Options to pass into the constructor.
+ *
+ * @param     token    the repo PAT or GITHUB_TOKEN
+ * @param     options  other options to set
+ */
+export function getOctokitOptions(
+  token: string,
+  options?: OctokitOptions
+): OctokitOptions {
+  const opts = Object.assign({}, options || {}) // Shallow clone - don't mutate the object provided by the caller
+
+  // Auth
+  const auth = Utils.getAuthString(token, opts)
+  if (auth) {
+    opts.auth = auth
+  }
+
+  return opts
+}