feat: docker-based dev. environment

Get a working dev. environment from scratch with minimal changes on your host system.

Server-side changes are hot-reloaded, you'll just need to refresh your browser page.

Dependencies:

apt install podman

Clone this repository and cd into it.

None of the build/install steps of the original doc are still required.

Build image:

podman build . -t llng-local-dev

Start container:

podman run -it -v ./:/app -p 8080:8080 llng-local-dev

Open http://auth.llng.localhost:8080/ in your browser.