these 2 derivations will be built:
  /nix/store/x9k28vlabgaz9rjh1lwgiablkcy83102-nixos-test-driver-pg_graphql.drv
  /nix/store/2gdnmg1dmcwywygdk3r0sn64dq7jv8h1-vm-test-run-pg_graphql.drv