these 4 derivations will be built:
  /nix/store/agagh1qlmxqidksq4rh9dira11yalksf-hello-docker-config.json.drv
  /nix/store/z912mbd3bg94yw81j8cncjh6zpjc8sqg-docker-layer-hello-docker.drv
  /nix/store/x4yj2lkxlky537cnn9yjqlzwpm3rfvp7-runtime-deps.drv
  /nix/store/swsi671qzqgh3ycyzmdhl0pinv386pry-docker-image-hello-docker.tar.gz.drv
these 9 paths will be fetched (1.1 MiB download, 3.9 MiB unpacked):
  /nix/store/zi2bj2hlavv8q743li2s9diqbcpmrf9b-hello-2.12.3
  /nix/store/h8jzzjfibqnigl9lbl9rvi9x7m1rysf4-jshon-20170302
  /nix/store/pv7bnrqva7pcaszchsf84f4dcpc2c37k-moreutils-0.70
  /nix/store/2c3k33kj3rx37ffkzbk3m1z5m6403fy7-perl-5.42.0-env
  /nix/store/7x3y2cp6147r0z2wsdg8xrdjycdlrys7-perl5.42.0-IO-Tty-1.20
  /nix/store/6yl9w59fa0ng92f4xfa0zqz0jm8zchjm-perl5.42.0-IPC-Run-20231003.0
  /nix/store/61f10qrj6acpk1l94x27kjvj26gah0gj-perl5.42.0-Time-Duration-1.21
  /nix/store/p2myx70hzjlwmkr04321iagqnx4zj13v-pigz-2.8
  /nix/store/br4gyry2kbk2x7nv8g51k3wi6jnzygg6-tarsum
docker-layer-hello-docker> No contents to add to layer.
docker-layer-hello-docker> Packing layer...
docker-layer-hello-docker> Finished building layer 'hello-docker'
runtime-deps> structuredAttrs is enabled
docker-image-hello-docker.tar.gz> Adding layer...
docker-image-hello-docker.tar.gz> tar: Removing leading `/' from member names
docker-image-hello-docker.tar.gz> Adding meta...
docker-image-hello-docker.tar.gz> Cooking the image...
docker-image-hello-docker.tar.gz> Finished.