Set up garage web UI

[rcdailey]

https://github.com/khairul169/garage-webui

[rcdailey]

The original garage-webui project (khairul169/garage-webui) is basically abandoned at this point. Last release was v1.1.0 in September 2025, and issue #61 over there is asking about project status with no maintainer response. It has partial Garage v2 support but delete bucket/key is still broken, and we're on v2.3.0 now.

The Garage team is building an official admin UI (garage-webadmin) that will eventually be bundled with Garage. As of April 2026 it's still in early development (README says "do not try to use it on your Garage cluster") and there's no container image yet.

Repurposing this issue to track the official garage-webadmin instead. I'll revisit once it ships a usable release with container images.