Option to halt progress when rate limited

[FRidh]

When rate-limited Nix continues building from source instead, as described also in https://github.com/DeterminateSystems/magic-nix-cache-action?tab=readme-ov-file#usage-notes. Is it feasible to halt when this occurs, and then continue after 60 seconds? In this case building from source takes far more time than having to wait once (or more).

Related to #29

[dbarrosop]

Yes, current behaviour is a bit unfortunate, specially as it "hards disable" the store which means you can't attempt to copy results that may not be cached automatically (like the check derivation).

[DaRacci]

This sounds like a very solid idea, though id imagine it may be a bit hard to implement due to nix probably wanting to timeout a download thats doing nothing but I'm not sure.