[feat] Add docker

[ooodwbooo]

I hope to add Docker deployment solutions for this project.

Provide a complete Dockerfile to build the project image
Support docker-compose.yml for one-click startup

[andylizf]

Agreed this would help deployment. Notes for anyone picking it up: the image needs the patched headless_shell (pixelshot install-chrome) plus the [serve] extra for the API; a compose file would pair the serve container with a tiles volume. PRs welcome.