these 2 derivations will be built:
  /nix/store/a658m8q3z11zxzzgad5imxhd5hzkfl6m-nixos-test-driver-pg_repack.drv
  /nix/store/ryx70wcw3f02gyxxy0fyvmwrshb0h5pn-vm-test-run-pg_repack.drv