Is it forbidden to work as a cleaner in a Christian slaughterhouse in France?

It is permissible for a Muslim to work for a non-Muslim under certain conditions. However, working in cleaning for Christians in a slaughterhouse involves humiliation and degradation for a Muslim, which is not permissible. This impermissibility is further emphasized if the slaughtered animals include pigs or other animals whose consumption is forbidden; this is because it entails condoning and accepting what is illicit.