Make lua source code string const

src/autoluakey.cpp

@@ -11,6 +11,8 @@ AutoLuaKey::AutoLuaKey() {
     lua.create_named_table("environments");
 
     bind_lua_functions();
+
+    // TODO: Load scripts from a folder and bind this function for lua to call
     register_lua_script("lua1", R"(
         function main()
             print('Hello from Lua! 1')
@@ -41,7 +43,7 @@ void AutoLuaKey::bind_ydotool() {
 
 int AutoLuaKey::lua_loop() {
     // emit global lua function to execute
-    std::string lua_code = R"(
+    const std::string lua_code = R"(
         function main()
             for i = 1, 10 do
                 -- Execute each environment's main function