these 2 derivations will be built:
  /nix/store/zj4hc1agybc675n0dai64qifnm1z3s17-nixos-test-driver-pg_repack.drv
  /nix/store/dnvrddphs02pij1nd6w1c1dc3vqbzlns-vm-test-run-pg_repack.drv