Set explicit timeout in the dev proxy

Otherwise longer debug sessions will get terminated

frontend/cli_to_rails_proxy.js

@@ -5,6 +5,7 @@ const PROXY_CONFIG = [
     "context": ['/**'],
     "target": `http://${PROXY_HOSTNAME}:3000`,
     "secure": false,
+    "timeout": 360000,
     // "bypass": function (req, res, proxyOptions) {
     // }
   }