fix forgotten user in k3s user creation

fix hard-coded username in k3s user creation

nix/flake/scripts/gen-k3s-cert.sh

@@ -45,10 +45,10 @@ spec:
 "
 
 echo Creating K8S CSR resource
-ssh "$host" "echo \"$k8s_csr\" | k3s kubectl apply -f -"
+ssh "root@$host" "echo \"$k8s_csr\" | k3s kubectl apply -f -"
 
 echo Approving K8S CSR
-ssh "$host" "k3s kubectl certificate approve $username-csr"
+ssh "root@$host" "k3s kubectl certificate approve $username-csr"
 
 echo Retrieving approved certificate
 encoded_cert="$(ssh root@"$host" "k3s kubectl get csr $username-csr -o jsonpath='{.status.certificate}'")"
@@ -69,7 +69,7 @@ clusters:
 contexts:
 - context:
     cluster: default
-    user: pim
+    user: $username
   name: default
 current-context: default
 kind: Config