Consider more idomatic docker config

[chrishoage]

While working on my PR I made extensive changes to the Dockerfile and I'm wondering if you think I should upstream them.

• I added an entrypoint.sh which configured the environment
• Using the entrypoint allow the user to specify the DOCKER_GID and add dagu to the docker group
• Use su-exec to execute dagu as the dagu user
• Changed the home directory and DAGU_HOME to be /config. This is a more idiomatic way of handling docker container configs
• removed sudo and dagu in sudoers

What this allows for is a much cleaner docker compose setup.

• No need to run a container o run socat and forward the docker socket. Just bind to to the container
• Allows users to load extra config though /entrypoint.d/*.sh (this is not done in my test branch, but could very easily be added. I have a lazy ADDITIONAL_PACKAGES but I don't think this should be shipped as is)

You can look at my changes here chrishoage@23eae41 and if any of these are worth upstreaming I can produce a PR with the parts you think would be a good fit for the official docker image.

services:
  caddy:
    image: caddy
    container_name: caddy
    hostname: caddy
    ports:
      - "8080:80"
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile
  dagu:
    image: ch/dagu
    container_name: dagu
    hostname: dagu
    volumes:
      - ./config:/config
      - ./scripts:/scripts
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      # - ADDITIONAL_PACKAGES=docker-cli deno bash
      - PUID=1000
      - PGID=1000
      - DOCKER_GID=970
      - DAGU_TZ=America/Los_Angeles

http://localhost {
  handle /dagu* {
    reverse_proxy dagu:8080
  }
}

[chrishoage]

To be clear I'm happy to upstream only parts of this. I realize that the /config change is a breaking change and may not be desirable.

I think the entrypoint.sh changes shouldn't be breaking changes in cases where people followed the existing docker compose examples.

If all or part of these changes would be welcome upstream I am happy to break apart the work

[yohamta]

Hey @chrishoage, thank you for the great suggestion! Yes, a PR for that would be much appreciated! :)

[chrishoage]

Okay I will work on cleaning up my changes and upstream them.

I will attempt to make everything backwards compatible as much as I can, but the move to /config may make that difficult. We'll see.

(I'm a little busy a the moment so this may take until next week to complete)