these 2 derivations will be built:
  /nix/store/aifgindpgxd4wcm4xv3hjr33izdd55z1-rootfs-ubuntu-26_04.drv
  /nix/store/5wxmxmdbgm1841qqxmdfkh3w3mqvrzaz-container-test-ubuntu-26-04-existing-files.drv