wildcard dns for docker-compose using dnsmasq

dnsmasq.conf

# explicitly define host-ip mappings
# dnsmasq entries are always wildcard entries, so this maps both myapp.local and *.myapp.local
address=/myapp.local/219.219.219.125

# set the upstream resolver for people running Linux; this allows all other DNS to be resolved:
server=1.1.1.1
server=1.0.0.1

docker-compose.yml

version: '3.9'

networks:
  my_network:
    ipam:
      config:
        - subnet:   219.219.219.64/26 # In order to specify static IPs, we must explicitly declare the subnet

services:
  dnsmasq:
    image: strm/dnsmasq
    volumes:
      - ./dnsmasq.conf:/etc/dnsmasq.conf
    cap_add:
      - NET_ADMIN
    networks:
      my_network:
        ipv4_address: 219.219.219.126
        
  myapp:
    # ...
    # your app config here
    # ...
    networks:
      my_network:
        # Set a static IP for dnsmasq config. This will allow us to wildcard catch all our sub-domains.
        ipv4_address: 219.219.219.125

  appclient:
    # ...
    # more container config
    # ...
    networks:
      - my_network
    dns:
      - 219.219.219.126 # dnsmasq container

# `appclient` should now be able to access `myapp` as myapp.local or foo.myapp.local

A docker compose v3 compliant version.