fix: take KUBECONFIG env variable into consideration (#340)

Before, the default value set for the `--kubeconfig` flag prevented the
`KUBECONFIG` env variable to be ever taken into consideration. This
behavior has now been fixed.

If `--kubeconfig` flag is set, it takes precedence over the `KUBECONFIG` env
variable.

fixes #331

Signed-off-by: Patrick Pichler <git@patrickpichler.dev>
Co-authored-by: Patrick Pichler <git@patrickpichler.dev>

pkg/kubernetes/kubernetes.go

@@ -44,8 +44,14 @@ func NewClient(kubecontext string, kubeconfig string) (*Client, error) {
 	var config *rest.Config
 	config, err := rest.InClusterConfig()
 	if err != nil {
+		loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
+
+		if kubeconfig != "" {
+			loadingRules.ExplicitPath = kubeconfig
+		}
+
 		clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
-			&clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfig},
+			loadingRules,
 			&clientcmd.ConfigOverrides{
 				CurrentContext: kubecontext,
 			})