diff --git a/.github/workflows/qa.yml b/.github/workflows/qa.yml
index 0409f90..b233711 100644
--- a/.github/workflows/qa.yml
+++ b/.github/workflows/qa.yml
@@ -14,11 +14,16 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
+      - name: Build
+        run: |
+          set -euxo pipefail
+          nix build --show-trace \
+            --option max-jobs 1 \
+            --option cores 4 \
+            .#tests.x86_64-linux.openstack-default-setup.driver
       - name: Basic setup
         run: |
-          nix build -Lv .#tests.x86_64-linux.openstack-default-setup.driver
-          ./result/bin/nixos-test-driver
+          nix run .#tests.x86_64-linux.openstack-default-setup.driver
       - name: Live migration
         run: |
-          nix build -Lv .#tests.x86_64-linux.openstack-live-migration.driver
-          ./result/bin/nixos-test-driver
+          nix run .#tests.x86_64-linux.openstack-live-migration.driver
diff --git a/packages/nova.nix b/packages/nova.nix
index 100d5d2..4b37afb 100644
--- a/packages/nova.nix
+++ b/packages/nova.nix
@@ -95,6 +95,7 @@ let
     "test_inject_admin_password"
     "test_server_pool_waitall"
     "test_validation_errors_19_traits_multiple_additional_traits_two_invalid"
+    "test_schedule_and_build_multiple_cells"
   ];
 
   excludeListFile = writeScript "test_excludes" (lib.concatStringsSep "\n" testExcludes);
diff --git a/tests/openstack-default-setup.nix b/tests/openstack-default-setup.nix
index bf7836e..9b1b68d 100644
--- a/tests/openstack-default-setup.nix
+++ b/tests/openstack-default-setup.nix
@@ -155,7 +155,7 @@ pkgs.nixosTest {
       print(f"openstack volume show test_vol: {output}")
 
       # wait until volume is attached
-      assert retry_until_succeed(controllerVM, "openstack volume show test_vol -f value -c status | grep 'in-use'", 20)
+      assert retry_until_succeed(controllerVM, "openstack volume show test_vol -f value -c status | grep 'in-use'", 40)
 
       # add ssh host key to known_hosts
       retry_until_succeed(controllerVM, f"ip netns exec {net_ns} ssh-keyscan {vm_ip} > ~/.ssh/known_hosts", 60)