Setting data_dir variable to lua scripts to a string with the package data folder

pkg/main.go

@@ -96,7 +96,7 @@ func InstallPackage(file io.Reader, destDir string) error {
 	if err != nil {
 		return err
 	}
-	L.SetGlobal("data_dir", lua.LFalse)
+	L.SetGlobal("data_dir", lua.LString(filepath.Join(destDir, "data")))
 	L.SetGlobal("script", lua.LString(manifest.Hooks.Install))
 
 	if err := L.DoFile(manifest.Hooks.Install); err != nil {