add appUrl config

src/app.controller.ts

@@ -26,6 +26,7 @@ export class AppController {
   async config() {
     // temp IS_OPENSHIFT: on appsoc servers, GHOST_HOST_AND_PORT is local network server name
     return {
+      appUrl: `https://${process.env.APP_HOST}`,
       ghostAdminUrl:
         ((process.env.IS_OPENSHIFT ? process.env.GHOST_HOST_AND_PORT : process.env.GHOST_URL_APPSOC) ||
           'http://localhost:2368') + '/ghost/',