Configurable SSH port

[leonvogt]

One of the machines I wanted to deploy to had a custom SSH port.
I think it would be handy if you could easily specify the SSH port, similar to the SSH user.
This PR would allow a port configuration like this:

ssh:
  port: 2222

[djmb]

Thanks for the PR @leonvogt!

There's one failing test, could you resolve it? 🙏

2023-10-30T08:41:42.1135161Z Failure:
2023-10-30T08:41:42.1136000Z MainTest#test_config [/home/runner/work/kamal/kamal/test/integration/main_test.rb:56]:
2023-10-30T08:41:42.1137067Z --- expected
2023-10-30T08:41:42.1137860Z +++ actual
2023-10-30T08:41:42.1138420Z @@ -1 +1 @@
2023-10-30T08:41:42.1139101Z -{:user=>"root", :keepalive=>true, :keepalive_interval=>30, :log_level=>:fatal}
2023-10-30T08:41:42.1140078Z +{:user=>"root", :port=>22, :keepalive=>true, :keepalive_interval=>30, :log_level=>:fatal}

[leonvogt]

@djmb
My bad, the integration tests didn't work properly on my machine.
Should be fixed now.

[djmb]

Thanks for the PR @leonvogt! Tests are all passing now.

If you had an insight into why the integrations test don't run for you, I'd be interested to know!

[djmb]

One other thing @leonvogt - could you raise a PR on https://github.com/basecamp/kamal-site to document the new setting? 🙏

[leonvogt]

One other thing @leonvogt - could you raise a PR on https://github.com/basecamp/kamal-site to document the new setting? 🙏

Sure thing, I'll do

[leonvogt]

If you had an insight into why the integrations test don't run for you, I'd be interested to know!

It fails at line 7 in the integration_test.
I'll get the following Docker output:

[...]
Step 10/20 : COPY *.sh .
When using COPY with more than one source file, the destination must be a directory and end with a /

The solution for me was to change COPY *.sh . to COPY *.sh ./ in the Dockerfile.
I'm not sure why I had to do this and other people don't. Therefore I didn't open a Issue or PR for that.