Hey @John6666! I hoped you might show up in this thread 
For a bit more information, I did encounter the “permanently building” issue multiple time, which I found information about in this thread (also featuring you: Space is Building... permanently). If I make a barebones proof of concept app featuring nginx, supervisord and uvicorn, it refuses to build. This example space I made public: Nginx Supervisord - a Hugging Face Space by benjamin-paine. To be clear, while this seems related to the initial issue, it may not be.
If using nginx as a proxy for internal connections is disallowed, I suppose I could understand, but HF themselves recommend using it in their documentation (I can’t add any more links - it’s at huggingface DOT co/docs/hub/en/spaces-sdks-docker) and it’s one of the easier tools to set up for adapting apps that run on multiple ports to a single-port space. It’d be a huge shame if we’re forced into using some esoteric-but-unflagged python package for proxying (or even worse, rolling our own) because of collateral damage from fighting bad actors.