Does this action benefit from a nix cache?

[hey2022]

I saw recently in aa3e38e that the FlakeHub Cache was removed from this repository's update workflow.

I ask my question because I thought that a cache like magic-nix-cache would cache the inputs that are unpacked from running nix flake update. However, I found that the magic-nix-cache does nothing and the action spends a lot of time with stuff like unpacking _ into the Git cache.... I'm not sure what it means by the Git cache tho, could anyone clarify that?

Also when running the action i get messages like the following even though i just updated the flake.lock and no changes were made to the lock file.

GIT_COMMIT_MESSAGE is: Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/e90b28967cacc64de7fb8742314ed0d7d12f47c6?narHash=sha256-c1Rq5Hc4WZLKj1RkmjLFCcX4QHBwrL%2BDIZNMEHno7DU%3D' (2025-07-11)
  → 'github:nix-community/home-manager/bf893ad4cbf46610dd1b620c974f824e266cd1df?narHash=sha256-mCHfZhQKdTj2JhCFcqfOfa3uKZbwUkPQbd0/zPnhOE8%3D' (2025-07-13)

Is there a way to make this action not need to download and unpack all these inputs if nothing was updated in the lockfile?