add config option to set github host

src/git-auth-helper.ts

@@ -52,7 +52,7 @@ class GitAuthHelper {
     this.settings = gitSourceSettings || (({} as unknown) as IGitSourceSettings)
 
     // Token auth header
-    const serverUrl = urlHelper.getServerUrl()
+    const serverUrl = urlHelper.getServerUrl(gitSourceSettings?.setHost)
     this.tokenConfigKey = `http.${serverUrl.origin}/.extraheader` // "origin" is SCHEME://HOSTNAME[:PORT]
     const basicCredential = Buffer.from(
       `x-access-token:${this.settings.authToken}`,

src/git-source-settings.ts

@@ -83,4 +83,10 @@ export interface IGitSourceSettings {
    * Indicates whether to add repositoryPath as safe.directory in git global config
    */
   setSafeDirectory: boolean
+
+  /**
+   * Set a host to override the automatic detection. Useful when you need to clone
+   * from cloud when running an action on an on prem server
+   */
+  setHost: string | undefined
 }

src/url-helper.ts

@@ -1,14 +1,15 @@
 import * as assert from 'assert'
 import {IGitSourceSettings} from './git-source-settings'
 import {URL} from 'url'
+import { settings } from 'cluster'
 
 export function getFetchUrl(settings: IGitSourceSettings): string {
   assert.ok(
     settings.repositoryOwner,
     'settings.repositoryOwner must be defined'
   )
   assert.ok(settings.repositoryName, 'settings.repositoryName must be defined')
-  const serviceUrl = getServerUrl()
+  const serviceUrl = getServerUrl(settings.setHost)
   const encodedOwner = encodeURIComponent(settings.repositoryOwner)
   const encodedName = encodeURIComponent(settings.repositoryName)
   if (settings.sshKey) {
@@ -19,7 +20,10 @@ export function getFetchUrl(settings: IGitSourceSettings): string {
   return `${serviceUrl.origin}/${encodedOwner}/${encodedName}`
 }
 
-export function getServerUrl(): URL {
+export function getServerUrl(configHost: string|undefined = undefined): URL {
+  if (configHost) {
+    return new URL(configHost)
+  }
   // todo: remove GITHUB_URL after support for GHES Alpha is no longer needed
   return new URL(
     process.env['GITHUB_SERVER_URL'] ||