This step installs Tuist and runs tuist generate with given options.
$AC_TUIST_PATH: The path to the directory of Tuist project. By default, it is set to the root directory of the cloned repository.
$AC_TUIST_VERSION: The version of Tuist, you can specify a specific Tuist version. If it is empty, Appcircle will install the latest version of Tuist.