refactor(conf): replace client conf file by env var

Related to https://forge.grandlyon.com/web-et-numerique/factory/pamn_plateforme-des-acteurs-de-la-mediation-numerique/pamn_client/-/issues/536

src/app.controller.ts

@@ -13,4 +13,16 @@ export class AppController {
       version: version,
     };
   }
+
+  @Get('config')
+  async config() {
+    // temp IS_OPENSHIFT: on appsoc servers, GHOST_HOST_AND_PORT is local network server name
+    return {
+      ghostAdminUrl:
+        ((process.env.IS_OPENSHIFT ? process.env.GHOST_HOST_AND_PORT : process.env.GHOST_URL_APPSOC) ||
+          'http://localhost:2368') + '/ghost/',
+      matomoTrackerUrl: process.env.MATOMO_URL,
+      matomoSiteId: process.env.MATOMO_SITEID,
+    };
+  }
 }