Poetry solves a very real problem, but I kinda hate it. It's not a pleasant tool to use.

Allow me to out-bore you, because there's way to much excitement in your solution. We just build Debian packages and deploy our applications that way. The Debian packaging infrastructure could be better, but mostly it just wraps around setuptools/pyproject. You need to rebuild your containers every time there's a security update to package, we just set apt to auto-update.