packages: properly activate configuration to switch /etc files

packages.nix

@@ -216,7 +216,14 @@ lib.attrsets.mapAttrs
 
             if [[ -n ''${NIXOS_REBUILD:-} ]]; then
               echo "Switching to configuration..."
-              ssh ${target} -- ${toplevelOutPath}/bin/switch-to-configuration "''${@:-switch}"
+              ssh ${target} bash -e <<END
+              set -eou pipefail
+
+              ${toplevelOutPath}/bin/switch-to-configuration "''${@:-switch}"
+              nix-env -p /nix/var/nix/profiles/system --set ${toplevelOutPath}
+            END
+            # ^ yes, this is required to be like this
+
             fi
           ''
           else throw "${name} is not configured to run on microvm.nix. Is it a physical host or is it deployed in Skyflake?"