Short summary of the latest changes:

 * Exposed ports have been switched to host-mode port publishing by default
   This adds support for IPv6 ingress, which means that after deploying this
   change, DNS AAAA records can be made to point to the relevant IPv6
   address and Traefik will handle public IPv6 ingress traffic (including ACME
   HTTP-01 challenges)

   /!\ This is a breaking change. It is still possible to revert ports 80 and
       443 to ingress-mode (the previous default) but keep in mind that there
       is no longer an easy way to publish additional ports in ingress mode.
