fix: engines install pre-release

engine/cli/commands/engine_install_cmd.cc

@@ -33,6 +33,7 @@ bool EngineInstallCmd::Exec(const std::string& engine,
 
   httplib::Client cli(host_ + ":" + std::to_string(port_));
   Json::Value json_data;
+  json_data["version"] =  version.empty() ? "latest" : version;
   auto data_str = json_data.toStyledString();
   cli.set_read_timeout(std::chrono::seconds(60));
   auto res = cli.Post("/v1/engines/install/" + engine, httplib::Headers(),

engine/controllers/engines.cc

@@ -20,7 +20,7 @@ void Engines::InstallEngine(
     return;
   }
 
-  auto version{"latest"};
+  auto version = (*(req->getJsonObject())).get("version", "latest").asString();
   auto result = engine_service_->InstallEngineAsync(engine, version);
   if (result.has_error()) {
     Json::Value res;