Yes, although there are (at least) two different meanings of "I don't trust your setup script". If I don't trust them to not do nefarious/malicious things, then

Yes, although there are (at least) two different meanings of "I don't trust your setup script". If I don't trust them to not do nefarious/malicious things, then I also shouldn't trust their Docker container either. If I just don't trust them to write a good setup script, eg, getting permissions right, putting pid files in the right location, not stomping on other stuff in various directories, etc. Docker solves that problem. They can put whatever badly written crap they want in the container and I do have some guarantees that it won't break the system it's running on.