Add a way to launch many KTDs in parallel

In many situations, we need to run several instances:

  • In the middle of a dev, we are asked to QA something and don't want to go through setting everything back to where we were once we finished.
  • We need to compare the behavior in two different codebases
  • See different versions of Koha in parallel
  • Etc

One of the issues for doing this is that we have a hardcoded set of ports for KTD, and there's also the problem with the hostnames.

I propose we use:

  • A local reverse proxy to route requests to each KTD instance
  • Have a way to specify different KTD instance names

For the end user it would imply:

ktd_proxy --start
ktd --proxy --name nick up -d

Then, the KTD instance will be available in nick.localhost and nick-intra.localhost, through a standard port (shared by all instances).

If we wanted to launch (say) a 23.11 Koha in parallel:

cd ~/git
git clone koha/ --branch=23.11.x koha-23.11/
SYNC_REPO=/Users/tcohen/git/koha-23.11 ktd --proxy --name tomas up -d

which would be accessible in tomas.localhost and tomas-intra.localhost.

This can of course be combined with different DB_IMAGE and KOHA_IMAGE if needed.

The proxy I'd pick is traefik which is pretty handy for dynamic route definitions.