these 11 derivations will be built:
  /nix/store/5vcisylnc4l8pbpg243nv38xqw351s9x-unit-niks3.service.drv
  /nix/store/qzb5di1dx0vyvm3w9qjqrn4hg2g3rxrb-system-units.drv
  /nix/store/7h54x7akq9y04zi031ngnwq27qilj5qv-etc.drv
  /nix/store/1q5nwixpm9z98hc5lrr53d5kmzmdmn2h-activate.drv
  /nix/store/agkdnj9m2m3knrzchfq0ilgwa0fa6wdp-nixos-system-server-test.drv
  /nix/store/asa74w2wlz6ddmflwfb04flp4v1g89rv-closure-info.drv
  /nix/store/i6avgkl0xbpwz9kr9y4s6kv1qa3i10xc-run-nixos-vm.drv
  /nix/store/xjqlb26mv37py47gsnklql4ddkcn99sy-nixos-vm.drv
  /nix/store/7lz7c8fs7gk90yi4f9c00gcmjkhm8h3a-driverConfiguration.json.drv
  /nix/store/9glsivikmaj8261w81drdbvyajlsj13w-nixos-test-driver-nixos-test-external-signer.drv
  /nix/store/3glk5y0zhf78bygw4ib1ih57xmg2mjkq-vm-test-run-nixos-test-external-signer.drv
Failed to find a machine for remote build!
derivation: 3glk5y0zhf78bygw4ib1ih57xmg2mjkq-vm-test-run-nixos-test-external-signer.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], [])