feat: Add Docker and Docker Compose support

[james2doyle]

I want to run this on my local network using Dokploy. This requires docker support specifically with docker-compose.

If this is accepted, it would be great to use github actions to build a container image to then be used in docker-composer like so:

services:
  clawlet:
    # images can be hosted on github
    image: ghcr.io/mosaxiv/clawlet:latest
    container_name: clawlet
    ports:
      - "18790:18790"
    environment:
      - OPENROUTER_API_KEY=${OPENROUTER_API_KEY}
    volumes:
      - ./clawlet.config.json:/root/.clawlet/config.json
    entrypoint: ["clawlet", "gateway"]
    stdin_open: true
    tty: true

This would allow anyone to quickly get clawlet running in a container without cloning or installing anything

[mosaxiv]

Thanks for the PR!
I’ve made a few changes here: #4

I don’t think Docker Compose is needed at the moment.
If you feel it’s necessary, feel free to submit it again.