Add _kubectl_config_merge for merging kube configs

_kubectl_config_merge

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+#
+# Merge kube config file on stdin with the existing kube config file.
+
+set -euo pipefail
+tmp=$(mktemp)
+new=$(mktemp)
+cat > "${tmp}"
+
+function _exit() {
+  rm -f "${tmp}" "${new}"
+}
+
+trap _exit EXIT
+
+export KUBECONFIG="${tmp}:${HOME}/.kube/config"
+kubectl config view --merge --flatten > "${new}"
+mv "${new}" ~/.kube/config