this derivation will be built:
  /nix/store/9b1i9d9gv5prg6r0yvbv7iyfmpkds0gc-pytest-impure.drv
Failed to find a machine for remote build!
derivation: jl0znhy8p27ph5l4w52i1xv92in31f4x-pytest-impure.drv
required (system, features): (aarch64-darwin, [ca-derivations])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])
error: Cannot build '/nix/store/jl0znhy8p27ph5l4w52i1xv92in31f4x-pytest-impure.drv'.
       Reason: platform mismatch
       Required system: 'aarch64-darwin'
       Current system: 'x86_64-linux'
error: build of resolved derivation '/nix/store/jl0znhy8p27ph5l4w52i1xv92in31f4x-pytest-impure.drv' failed