add dockerfile for lxmf_distribution_group_extended

[wallaby-gopher]

Hello,
I know a lot of people like to use docker for server styled systems, so I think it would be beneficial if you threw something like this in there for folk to use:

volumes:
  groupchat:
services:
  groupchat:
    build:
        dockerfile_inline: |
            FROM python:alpine
            RUN pip install --upgrade pip \
                && pip install --upgrade rns \
                #&& pip install pyserial netifaces \
                && pip install lxmf \
                && wget https://raw.githubusercontent.com/SebastianObi/LXMF-Tools/main/lxmf_distribution_group_extended/lxmf_distribution_group_extended.py \
                && chmod +x lxmf_distribution_group_extended.py \
    init: true
    pull_policy: always
    tty: true #to keep it running
    container_name: "groupchat"
    command: ./lxmf_distribution_group_extended.py
    volumes:
      - groupchat:/root/
      - type: bind
        source: /[path to your config.cfg]/config.cfg
        target: /root/.config/lxmf_distribution_group_extended/config.cfg
      - type: bind
        source: /[path to your data.cfg]/data.cfg
        target: /root/.config/lxmf_distribution_group_extended/data.cfg
    configs:
      - source: config
        target: /root/.reticulum/config
    restart: always


configs:
  config:
    content: |
        [reticulum]
        enable_transport = True
        share_instance = Yes
        loglevel = 7
        [interfaces]
         [[RNS Testnet Amsterdam]]
             type = TCPClientInterface
             enabled = yes
             target_host = amsterdam.connect.reticulum.network
             target_port = 4965

Thanks for the cool groupchat!