Add kubernetes

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/kubernetes/addons/default.nix

@@ -0,0 +1,7 @@
+{ config, lib, ... }:
+{
+  services.kubernetes.addonManager.bootstrapAddons = lib.mkMerge [
+    (import ./bootstrap { inherit config; })
+    (import ./metrics-server { })
+  ];
+}