ci: cache nix store #254

1. 
   Sjors commented at 5:15 pm on March 11, 2026: member

   I suspect that especially the 32 bit job will run a lot faster if we cache the nix store.

   #252 / #253 add caching anyway, so we could try after one of those lands.

2. ryanofsky closed this on Mar 26, 2026

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