fix docker startup config error

main.cc

@@ -5,16 +5,46 @@
 #include "repositories/MigrationRunner.h"
 
 #include <cstdio>
+#include <fstream>
+#include <cstdlib>
 
 int main()
 {
     setvbuf(stdout, nullptr, _IONBF, 0);
     (void)RequestLogger::classTypeName();
 
+    Json::Value config;
+    std::ifstream configFile("config.json");
+    if (configFile.is_open())
+    {
+        configFile >> config;
+        
+        if (const char* envHost = std::getenv("DB_HOST"))
+            config["db_clients"][0]["host"] = envHost;
+        if (const char* envPort = std::getenv("DB_PORT"))
+            config["db_clients"][0]["port"] = std::stoi(envPort);
+        if (const char* envUser = std::getenv("DB_USER"))
+            config["db_clients"][0]["user"] = envUser;
+        if (const char* envPass = std::getenv("DB_PASSWORD"))
+            config["db_clients"][0]["passwd"] = envPass;
+        if (const char* envDb = std::getenv("DB_NAME"))
+            config["db_clients"][0]["dbname"] = envDb;
+            
+        if (const char* envSmtpHost = std::getenv("SMTP_HOST"))
+            config["custom_config"]["mail"]["smtp_host"] = envSmtpHost;
+        if (const char* envSmtpPort = std::getenv("SMTP_PORT"))
+            config["custom_config"]["mail"]["smtp_port"] = std::stoi(envSmtpPort);
+
+        drogon::app().loadConfigJson(config);
+    }
+    else
+    {
+        drogon::app().loadConfigFile("config.json");
+    }
+
     Json::Value requestLoggerConfig;
     requestLoggerConfig["include_query"] = true;
 
-    drogon::app().loadConfigFile("config.json");
     drogon::app().addPlugin("RequestLogger", {}, requestLoggerConfig);
     visione::cors::configure();