feat(cmd): better ergonomics around lk app and templates#474

rektdeckard merged 3 commits intomainlivekit/livekit-cli:mainfrom

tobias/dex-994-lk-app-env-should-emit-to-stdout-instead-of-overwriting-bylivekit/livekit-cli:tobias/dex-994-lk-app-env-should-emit-to-stdout-instead-of-overwriting-byCopy head branch name to clipboard