these 2 derivations will be built:
  /nix/store/l36lj52kspjrxb7x6hv1q51869bn8xy2-nixos-test-driver-pg_repack.drv
  /nix/store/ysswwkm8qc7jmli14ihqb7p27liqbkiz-vm-test-run-pg_repack.drv