Currently `Exec / Attach` failed with `Failed to connect…` after trying a few commands. Seems like `/bin/ash` should be added into [getAvailableShells()](https://github.com/kubernetes-sigs/headlamp/blob/9146fb8dcfaf2e883d067f9705056be7fd246927/frontend/src/components/common/Terminal.tsx#L357) (or a way to customize from UI)