K8s integration tests

[omus]

Adds integration tests to this package which utilize K8sDeputy.jl in a K8s cluster. Some of these tests verify the behaviour of Julia and K8s handling around graceful termination. If these tests fail this could indicate that the content in this package may need to be adjusted.

[omus]

Interesting unit test failure. Probably just started this check before the server started? Probably just need to add a retry to this:

graceful termination: Error During Test at /home/runner/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:217
  Test threw exception
  Expression: timedwait(Second(10)) do 
        #= /home/runner/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:218 =#
        r = HTTP.get("http://$(localhost):$(port)/health/ready"; status_exception = false)
        #= /home/runner/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:219 =#
        return r.status == 200
    end === :ok
  HTTP.ConnectError for url = `[http://127.0.0.1:53563/health/ready`:](http://127.0.0.1:53563/health/ready%60:) IOError: connect: connection refused (ECONNREFUSED)
  Stacktrace:
   [1] getconnection(::Type{Sockets.TCPSocket}, host::SubString{String}, port::SubString{String}; keepalive::Bool, readtimeout::Int64, kw::@Kwargs{require_ssl_verification::Bool, iofunction::Nothing, decompress::Nothing, verbose::Int64, status_exception::Bool})
     @ HTTP.Connections ~/.julia/packages/HTTP/LsfSO/src/Connections.jl:526
   [2] getconnection
     @ ~/.julia/packages/HTTP/LsfSO/src/Connections.jl:503 [inlined]
   [3] #10
     @ ~/.julia/packages/HTTP/LsfSO/src/Connections.jl:462 [inlined]
   [4] (::ConcurrentUtilities.var"#2#4"{Any, Timer, ConcurrentUtilities.TimedOut{Any}, Channel{Any}, HTTP.Connections.var"#10#13"{Sockets.TCPSocket, Bool, Bool, @Kwargs{readtimeout::Int64, iofunction::Nothing, decompress::Nothing, verbose::Int64, status_exception::Bool}, SubString{String}, SubString{String}}})()
     @ ConcurrentUtilities ~/.julia/packages/ConcurrentUtilities/yudGS/src/try_with_timeout.jl:82
  Stacktrace:
    [1] (::HTTP.ConnectionRequest.var"#connections#4"{HTTP.ConnectionRequest.var"#connections#1#5"{HTTP.TimeoutRequest.var"#timeouts#3"{HTTP.TimeoutRequest.var"#timeouts#1#4"{HTTP.ExceptionRequest.var"#exceptions#2"{HTTP.ExceptionRequest.var"#exceptions#1#3"{typeof(HTTP.StreamRequest.streamlayer)}}}}}})(req::HTTP.Messages.Request; proxy::Nothing, socket_type::Type, socket_type_tls::Type, readtimeout::Int64, connect_timeout::Int64, logerrors::Bool, logtag::Nothing, kw::@Kwargs{iofunction::Nothing, decompress::Nothing, verbose::Int64, status_exception::Bool})
      @ HTTP.ConnectionRequest ~/.julia/packages/HTTP/LsfSO/src/clientlayers/ConnectionRequest.jl:86
...
      @ HTTP ~/.julia/packages/HTTP/LsfSO/src/HTTP.jl:457
   [14] #request#20
      @ ~/.julia/packages/HTTP/LsfSO/src/HTTP.jl:315 [inlined]
   [15] request (repeats 2 times)
      @ ~/.julia/packages/HTTP/LsfSO/src/HTTP.jl:313 [inlined]
   [16] get
      @ ~/.julia/packages/HTTP/LsfSO/src/HTTP.jl:518 [inlined]
   [17] #36
      @ ~/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:218 [inlined]
   [18] timedwait(testcb::var"#36#58"{Int64}, timeout::Float64; pollint::Float64)
      @ Base ./asyncevent.jl:341
   [19] #timedwait#2
      @ /opt/hostedtoolcache/julia/1.10.2/x64/share/julia/stdlib/v1.10/Dates/src/types.jl:470 [inlined]
   [20] timedwait(testcb::Function, timeout::Second)
      @ Dates /opt/hostedtoolcache/julia/1.10.2/x64/share/julia/stdlib/v1.10/Dates/src/types.jl:469
   [21] macro expansion
      @ /opt/hostedtoolcache/julia/1.10.2/x64/share/julia/stdlib/v1.10/Test/src/Test.jl:669 [inlined]
   [22] macro expansion
      @ ~/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:217 [inlined]
   [23] macro expansion
      @ /opt/hostedtoolcache/julia/1.10.2/x64/share/julia/stdlib/v1.10/Test/src/Test.jl:1577 [inlined]
   [24] macro expansion
      @ ~/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:195 [inlined]
   [25] macro expansion
      @ /opt/hostedtoolcache/julia/1.10.2/x64/share/julia/stdlib/v1.10/Test/src/Test.jl:1577 [inlined]
   [26] top-level scope
      @ ~/work/K8sDeputy.jl/K8sDeputy.jl/test/health.jl:13

[omus]

Looked into the exact Julia version which started supporting Pkg.precompile(; timing) and found:

• Pkg.jl PR to introduce the change was: precompile: add timing mode JuliaLang/Pkg.jl#3334
• The stdlib/Pkg.version was updated to include this Pkg.jl version in Julia version 1.10.0-DEV.445 (1ef65e4c89) and "backported" in Julia version 1.9.0-beta2.67 (f5a6860559)

[omus]

I'm getting close to getting these integration tests working but I think I'll make the initial release of this package so I'm not holding things up.

[omus]

I've had some other higher priority things to do lately but I do want to get back to this.