Enable Longhorn at last

Enable the iscsi services on the local hosts
Enable special NixOS style Longhorn workarounds
Enable Longhorn in Kubernetes, as well
Update host names to point at Longhorn
Expose Longhorn UI and secrets

modules/nixos/kubernetes.nix

@@ -43,6 +43,8 @@ in
       pkgs.kubernetes-helm
       pkgs.kustomize
       pkgs.k9s
+      pkgs.openiscsi
+      pkgs.nfs-utils # Needed for Longhorn
     ];
 
     networking.firewall = {
@@ -111,6 +113,10 @@ in
             '';
           };
         };
+      openiscsi = {
+        enable = true;
+        name = "${config.networking.hostName}-initiatorhost";
+      };
     };
 
     users = {