Skip the SSH tests on MacOS

Author: JamesWrigley

test/runtests.jl

@@ -10,8 +10,9 @@ include(joinpath(Sys.BINDIR, "..", "share", "julia", "test", "testenv.jl"))
 
 cmd = `$test_exename $test_exeflags`
 
-# LibSSH.jl currently only works on unixes
-if Sys.isunix()
+# LibSSH.jl currently only works on unixes, and the latest release currently
+# doesn't pass CI on MacOS.
+if Sys.islinux()
     # Run the SSH tests with a single thread because LibSSH.jl is not thread-safe
     sshtestfile = joinpath(@__DIR__, "sshmanager.jl")
     if Base.VERSION >= v"1.12-"