Fixes pi-hole config
Pi-hole, as it was configured, was not working for me on a fresh Ubuntu 18.04 (even as the only enabled service).
I've had to modify the configuration as per this PR to make it work:
- expose the port 53: make it accept DNS queries from anywhere
- Make pi-hole in the same network as traefik so that traefik can show the dashboard
- indicate a default DNS + deactivate
systemd-resolved: this one was trickier, as pihole needs to expose the port 53 to be available and the system needs a DNS resolver. Using the
dnsoption of docker was a way to bypass the unloaded systemd-resolved and also provides a great state-of-the-art DNS to refer to.
Let me know what you think.