Hi,

I'm trying to improve the workflow in here: https://github.com/hmemcpy/milewski-ctfp-pdf/blob/master/.github/workflows/build.yaml

Basically I would like to cache the build dependencies once, and re-use them in each book editions (8), so there is no need to download 8 times the same thing.

Caching the /nix/store directory works: https://github.com/drupol/milewski-ctfp-pdf/runs/5348859880?check_suite_focus=true

Restoring it fails: https://github.com/drupol/milewski-ctfp-pdf/runs/5348868521?check_suite_focus=true

Do you have any idea on how I could fix this ?