these 3 derivations will be built:
  /nix/store/0895j8cfbkpn8pjdx2c6yjbkapkb0kw4-uv-build-0.12.17.drv
  /nix/store/xxm7m3v85r383iqlmwd98yrmva86wvqx-example-0.1.0.drv
  /nix/store/7z4jaid7fkxk8pwc21m0wdhg4i3arh1n-example-venv.drv