Fixes #6679 (#6734)

Fixes #6679

radio/src/lua/api_general.cpp

@@ -1357,6 +1357,24 @@ static int luaGetRSSI(lua_State * L)
   return 3;
 }
 
+/*luadoc
+@function chdir(directory)
+
+ Change the working directory
+
+@param directory (string) New working directory
+
+@status current Introduced in 2.3.0
+
+*/
+
+static int luaChdir(lua_State * L)
+{
+  const char * directory = luaL_optstring(L, 1, nullptr);
+  f_chdir(directory);
+  return 0;
+}
+
 /*luadoc
 @function loadScript(file [, mode], [,env])
 
@@ -1554,6 +1572,7 @@ const luaL_Reg opentxLib[] = {
   { "defaultChannel", luaDefaultChannel },
   { "getRSSI", luaGetRSSI },
   { "killEvents", luaKillEvents },
+  { "chdir", luaChdir },
   { "loadScript", luaLoadScript },
   { "getUsage", luaGetUsage },
   { "resetGlobalTimer", luaResetGlobalTimer },