these 6 derivations will be built:
  /nix/store/8fbsnli9v639qdjrwcp376ps8x3krim1-nixos-disk-image.drv
  /nix/store/84vv2jl5bc0ajch9lgbfk9gnn5mhv0qq-run-nixos-vm.drv
  /nix/store/28kb2cvakd37rr5gqlzmgsln13d9hc69-nixos-vm.drv
  /nix/store/2gddn8p0g5az1gi03d5kavylzz9rbbmy-driverConfiguration.json.drv
  /nix/store/b5jz5d653z5m57yh6x48rvqnf9qzkwhq-nixos-test-driver-systemd-boot-extra-entries.drv
  /nix/store/xhpxj2bj6zdlagy6gr2iggqnmvjw8g3k-vm-test-run-systemd-boot-extra-entries.drv
Failed to find a machine for remote build!
derivation: 8fbsnli9v639qdjrwcp376ps8x3krim1-nixos-disk-image.drv
required (system, features): (aarch64-linux, [kvm])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
Failed to find a machine for remote build!
derivation: xhpxj2bj6zdlagy6gr2iggqnmvjw8g3k-vm-test-run-systemd-boot-extra-entries.drv
required (system, features): (aarch64-linux, [kvm, nixos-test])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])