Unable to set custom kubeconfig

[gandro]

Setting a custom kubeconfig path is broken. The following code does not pick up the the value of Options.Kubeconfig and falls back on the default instead:

kubeHarness := harness.New(harness.Options{
	Kubeconfig: "my-kubeconfig",
})

os.Exit(kubeHarness.Run(m))

I expected the above code to use "my-kubeconfig", but it ends up ignoring the option and falls back on the value of defaultKubeconfigPath() intsead.

It this seems to be caused by following unconditional call to SetKubeconfig which resets the options field to use the value of defaultKubeconfigPath(): https://github.com/dlespiau/kube-test-harness/blob/254907d8dca3f76f2f181864d70d86f01f648a3a/harness.go#L108-L112