consume new @actions/github for GHES support (#236)

src/github-api-helper.ts

@@ -6,9 +6,8 @@ import * as io from '@actions/io'
 import * as path from 'path'
 import * as retryHelper from './retry-helper'
 import * as toolCache from '@actions/tool-cache'
-import * as urlHelper from './url-helper'
 import {default as uuid} from 'uuid/v4'
-import {ReposGetArchiveLinkParams} from '@octokit/rest'
+import {Octokit} from '@octokit/rest'
 
 const IS_WINDOWS = process.platform === 'win32'
 
@@ -75,8 +74,8 @@ async function downloadArchive(
   ref: string,
   commit: string
 ): Promise<Buffer> {
-  const octokit = new github.GitHub(authToken, {baseUrl: urlHelper.getApiUrl()})
-  const params: ReposGetArchiveLinkParams = {
+  const octokit = new github.GitHub(authToken)
+  const params: Octokit.ReposGetArchiveLinkParams = {
     owner: owner,
     repo: repo,
     archive_format: IS_WINDOWS ? 'zipball' : 'tarball',

src/url-helper.ts

@@ -2,10 +2,6 @@ import * as assert from 'assert'
 import {IGitSourceSettings} from './git-source-settings'
 import {URL} from 'url'
 
-export function getApiUrl(): string {
-  return process.env['GITHUB_API_URL'] || 'https://api.github.com'
-}
-
 export function getFetchUrl(settings: IGitSourceSettings): string {
   assert.ok(
     settings.repositoryOwner,