Merge pull request 'fix: enable nix-command for remote gc and use --sudo' (#60) from stage into master

Reviewed-on: #60

nixos/kubeadm/scripts/rebuild-and-bootstrap.sh

@@ -132,7 +132,7 @@ rebuild_node() {
   timeout "$REBUILD_TIMEOUT" nixos-rebuild switch \
     --flake "$FLAKE_DIR#$node_name" \
     --target-host "$ACTIVE_SSH_USER@$node_ip" \
-    --use-remote-sudo
+    --sudo
 }
 
 rebuild_node_with_retry() {
@@ -172,7 +172,7 @@ prepare_remote_space() {
   local node_ip="$1"
   echo "==> Reclaiming disk space on $node_ip"
   remote "$node_ip" "sudo nix-collect-garbage -d || true"
-  remote "$node_ip" "sudo nix store gc || true"
+  remote "$node_ip" "sudo nix --extra-experimental-features nix-command store gc || true"
   remote "$node_ip" "sudo rm -rf /tmp/nix* /tmp/nixos-rebuild* || true"
 }