these 2 derivations will be built:
  /nix/store/y3l71k0w85my2zxhcp0acl4k9dggv671-nixos-test-driver-pg_graphql.drv
  /nix/store/ja59cfc65m75xqa0wvslcq4jb12dacbh-vm-test-run-pg_graphql.drv