fix(receive): --base-url option and GHE_HOST (#1719)

src/bin/probot-receive.ts

@@ -60,6 +60,15 @@ async function main() {
       'Set to your Sentry DSN, e.g. "https://1234abcd@sentry.io/12345"',
       process.env.SENTRY_DSN
     )
+    .option(
+      "--base-url <url>",
+      'GitHub API base URL. If you use GitHub Enterprise Server, and your hostname is "https://github.acme-inc.com", then the root URL is "https://github.acme-inc.com/api/v3"',
+      process.env.GHE_HOST
+        ? `${process.env.GHE_PROTOCOL || "https"}://${
+            process.env.GHE_HOST
+          }/api/v3`
+        : "https://api.github.com"
+    )
     .parse(process.argv);
 
   const githubToken = program.token;
@@ -89,6 +98,7 @@ async function main() {
     privateKey: String(privateKey),
     githubToken: githubToken,
     log,
+    baseUrl: program.baseUrl,
   });
 
   const appFn = await resolveAppFunction(