main: Pass absolute path of config file

As sandboxing code chroots and chdirs away,

qswiki.cpp

@@ -77,21 +77,21 @@ int main(int argc, char **argv)
 		Logger::error() << "Sandbox is not supported, exiting";
 		exit(EXIT_FAILURE);
 	}
+	if(argc < 2)
+	{
+		std::cerr << "no path to config file provided" << std::endl;
+		return 1;
+	}
+	std::string configpath = std::filesystem::absolute(argv[1]).string();
 	if(!sandbox->enableForInit())
 	{
 		Logger::error() << "Sandboxing for init mode could not be activated.";
 		exit(EXIT_FAILURE);
 	}
 
-	if(argc < 2)
-	{
-		std::cerr << "no path to config file provided" << std::endl;
-		return 1;
-	}
-
 	try
 	{
-		ConfigReader configreader(argv[1]);
+		ConfigReader configreader(configpath);
 		Config config = configreader.readConfig();
 
 		// TODO: config.connectiontring only works as long as we only support sqlite of course