> Every environment requires rebuilding the same application just to change configuration like API URLs, feature flags, or auth endpoints.
This is not normal. I have never worked anywhere, or on any project, where this was the case. (1) is already how we do things without the other points, which are not needed.
All of my services are containerized including their builds. It's not a "huge" problem, it's simple to deal with, including frontend builds. I suggest reading the documentation or asking an Ai how people in industry deal with this. Most of the Show HN posts like this can be better solved by asking an Ai how we already do things, as opposed to having it come up with an over engineered solution.