these 11 derivations will be built:
  /nix/store/k5x6li79b1qanj13mig5g17dc3vrm5ql-unit-niks3.service.drv
  /nix/store/apb2fzpmsbvg8y8s59j3ggzrywdzdnl0-system-units.drv
  /nix/store/flmq9y3rvczdgqlnn5c7c6v9bzmzncpg-etc.drv
  /nix/store/73aw5mvy0adar4d2ssv3cp0zj77wcjnx-activate.drv
  /nix/store/9n6s25p05m9pp2cfi54mlbrp0cccib5v-nixos-system-server-test.drv
  /nix/store/2shgqch9v2ijdkaqglkcdx6vw9lr54sm-closure-info.drv
  /nix/store/xw39grgndn90v09nnd3jgnpcnq8cb5aw-run-nixos-vm.drv
  /nix/store/j0v6c8m9a3w79r26anbmflxa6wfarkrx-nixos-vm.drv
  /nix/store/snawjrz4cjimiw2474flmaa2hdr3izvs-driverConfiguration.json.drv
  /nix/store/m8wa7gf8yy8vymfzfxsij4xdxbxx10vz-nixos-test-driver-nixos-test-external-signer.drv
  /nix/store/ybzq5fdz3fm9rlhhpbx45vb9grvda58y-vm-test-run-nixos-test-external-signer.drv
Failed to find a machine for remote build!
derivation: ybzq5fdz3fm9rlhhpbx45vb9grvda58y-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], [])