add compose.yaml for docker compose

[yt-koike]

Hello, I'm yt-koike.

I added compose.yaml to make building and starting easier.
With compose.yaml, all you need to do to use nerfstudio is the three following steps.

1. Type docker compose up -d to start server.
2. Type docker compose exec nerfstudio bash to start a shell and input commands.
3. Exit from the shell and type docker compose down to stop the server.

I also fixed format warnings in Dockerfile which are

• https://docs.docker.com/reference/build-checks/from-as-casing/
• https://docs.docker.com/reference/build-checks/json-args-recommended/
• https://docs.docker.com/reference/build-checks/legacy-key-value-format/

Please merge this PR if you don't mind. Thank you :)