Allow Traefik to run without publishing port

[tsvallender]

Adds the publish option which, if set to false, does not pass --publish to docker run when starting Traefik. This is useful when running Traefik behind a reverse proxy, for example.

Example deploy.yml:

traefik:
  publish: false

If not specified or set to true, the default or specified port will be used as per current behaviour.

[Zeko369]

Could you add a few lines in the docs about?

1: that this exists now
2: how to use it with an additional traefik/nginx rev proxy (or just a link to a guide) and a usecase (i.e. "if you want to host 2 apps on a same machine use this + a separate traefik/nginx")

[tsvallender]

Could you add a few lines in the docs about?

1: that this exists now 2: how to use it with an additional traefik/nginx rev proxy (or just a link to a guide) and a usecase (i.e. "if you want to host 2 apps on a same machine use this + a separate traefik/nginx")

Sure, in this case are the docs the README? Happy to add it to the site repo too but I assumed that would happen after this was merged (or at least approved)?

[dhh]

Can you rebase? Looks good to me.

[dhh]

Doc change needs to happen against basecamp/kamal-site repo.

[tsvallender]

I've rebased and added documentation to the site repo basecamp/kamal-site#17

[defsdoor]

Good work and a nice option - we run multiple application containers on different docker networks behind a broader proxy and have no need to bind to the host - this avoids port shuffling.