Kegco makes a couple kegerators that are meant to be outdoors. I kinda glossed over the outdoor selections because I was buying for the basement.
I remember shopping and seeing models that were actually meant to be outdoor built-ins, not just free-standing. For some reason purpose-made kegerators have some wild price ranges; some are under $1000 including tower and taps, others are several thousand with no clear justification as to why they’re more. So shop around.
If you go chest freezer, the trick is to build a collar out of some standard lumber. Search the DIY section. Some people have shown off some amazing carpentry. I rate my skills as Good, but not good enough to make something I’d have to look at everyday.