these 19 derivations will be built:
  /nix/store/fgnv1vgjj6jx7fay0jndg2bbzlq2m5q0-system-path.drv
  /nix/store/ha79nvywsv9m3g0xsgqlnw1qydyay7ha-dbus-1.drv
  /nix/store/qi6gw8vnnrk6r68rmgjxb5prmj1463y3-X-Restart-Triggers-dbus-broker.drv
  /nix/store/2agsysqqbzk23jd1fdv0fc5l2hdvl70v-unit-dbus-broker.service.drv
  /nix/store/44dch4vasyqk58m7dnky2waixx88rgkh-test-script.drv
  /nix/store/v0rgw2qpjgjnx5j458al8qirz8jwlv9s-user-units.drv
  /nix/store/820k8629k8mn1syh5h0ahf6xfk110yf2-unit-dbus-broker.service.drv
  /nix/store/n2bpvigkh3mg9dcvxxdxm278imzif2ij-unit-niks3.service.drv
  /nix/store/wrp3rm2871iz0fhrs89say4vn301z1ai-unit-niks3-gc.service.drv
  /nix/store/zbv6an2ngkir4wya5wxdq2wp61ymjdql-system-units.drv
  /nix/store/j2rrp02apv4rfwqfbxy15mn02kjn89zx-etc.drv
  /nix/store/f3fg70wnkib635l95y28y1xa45jm6mzr-activate.drv
  /nix/store/qq11q5k5cw183lgl2c9vlvbfnz6y7myl-nixos-system-server-test.drv
  /nix/store/w1d4jahn144g91zndh2jjgvh88lbzg7k-closure-info.drv
  /nix/store/gc1krkf1xf0n3nhr9lb3jnp26q3vy949-run-nixos-vm.drv
  /nix/store/8g9w76x4175wf94kw4jjianl6a2z6mkc-nixos-vm.drv
  /nix/store/84za32j28abfbkbxpjg2j5a4cfnfy8c2-driverConfiguration.json.drv
  /nix/store/3cii94yhva67bydimm8cdnxhv0vrr9a0-nixos-test-driver-nixos-test-external-signer.drv
  /nix/store/5r2r7zhb73pxdy248kqjnlj2vvcsa3mj-vm-test-run-nixos-test-external-signer.drv
Failed to find a machine for remote build!
derivation: 5r2r7zhb73pxdy248kqjnlj2vvcsa3mj-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], [])