Support for multiple values in KUBECONFIG variable

[rohanKanojia]

We need to check how the client is handling the case when KUBECONFIG variable has multiple values. If present, we should print a warning about which kubeconfig did we read for client operations.

Orignal issue: quarkusio/quarkus#8946

[rohanKanojia]

@manusa @iocanel : I checked and looks like multiple values are already being handled:

kubernetes-client/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/Config.java

Lines 469 to 483 in 2f857a9

	if (Utils.getSystemPropertyOrEnvVar(KUBERNETES_AUTH_TRYKUBECONFIG_SYSTEM_PROPERTY, true)) {
	String fileName = Utils.getSystemPropertyOrEnvVar(KUBERNETES_KUBECONFIG_FILE, new File(getHomeDir(), ".kube" + File.separator + "config").toString());
	// if system property/env var contains multiple files take the first one based on the environment
	// we are running in (eg. : for Linux, ; for Windows)
	String[] fileNames = fileName.split(File.pathSeparator);
	if (fileNames.length > 1) {
	LOGGER.debug("Found multiple Kubernetes config files [{}], using the first one: [{}].", fileNames, fileNames[0]);
	fileName = fileNames[0];
	}
	File kubeConfigFile = new File(fileName);
	if (kubeConfigFile.isFile()) {
	LOGGER.debug("Found for Kubernetes config at: ["+kubeConfigFile.getPath()+"].");

[manusa]

😄

So basically to fulfill the AC defined in my comment we just need to change the log level.