Whats the purpose of a "nightly" build of UPBGE?

On the official site for UPBGE, I can see what are called “nightly builds”. The UPBGE team releases a new iteration of those builds every week, and the current version is based on Blender 3.5 (UPBGE 0.35). My question is what is the purpose of these builds, and are these to slowly build up to a new stable release?

I am a bit curious to know.

To stay in sync with master,

Youle and Loki have to rebase on master constantly to keep up with code changes.

Some nightly builds are stable as far as use goes (no crashes etc) but when eevee next drops the devs wanted to do another stable release,

These only get bug fixes backported.