Add a prototype setup that uses OrbStack as the local Kubernetes
provider on macOS, aiming to save a few GB of RAM compared to the
current stack.
The script has been tested locally but was mostly built through vibe
coding, so it has not been thoroughly reviewed yet.
Follow-ups to look into:
* Simplify the ingress and CoreDNS setup if possible.
* Wire up a way to run tests and lint against the Tilt stack.
lebaudantoine