allow to use db_hostaddr, db_port or db_conn_string config parameters to connect to PostgreSQL

winixd/core/config.h

@@ -189,6 +189,16 @@ public:
 	// default: false
 	bool template_only_root_use_template_fun;
 
+	// the database connection string
+	// https://www.postgresql.org/docs/14/libpq-connect.html#LIBPQ-CONNSTRING
+	// default: empty (not used if empty)
+	std::wstring db_conn_string;
+
+	// the database host ip address and port number
+	// default: empty which means winix connects to a Unix-domain socket
+	std::wstring db_hostaddr;
+	std::wstring db_port;
+
 	// the database name, user name and a password for the PostgreSQL database
 	std::wstring db_database;
 	std::wstring db_user;