Update cachix/cachix-action action to v12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cachix/cachix-action	action	major	v8 -> v12

---

Release Notes

cachix/cachix-action

v12: cachix-action-v12

Compare Source

Fix save-state deprecation warning.

v11: cachix-action-v11

Compare Source

• Allow pushFilter regex to start with a dash
• Add pathsToPush and cachixArgs
• Avoid pushing .drv.chroot files
• Self-hosted runner support improvements

v10: cachix-action-v10

Compare Source

The previous release broke installations when using Nix from master branch.

This bug is fixed and has a regression test.

v9: cachix-action-v9

Compare Source

• when the action fails, don't display a frightening traceback
• use only stable Nix commands to avoid extra Nix configuration when using flakes
• new option pushFilter: Regular expression to exclude derivations when pushing, for example "(-source$|nixpkgs.tar.gz$)". Warning: this filter doet not guarantee it will not get pushed in case the path is part of the closure of something that will get pushed.

---

Configuration

📅 Schedule: Branch creation - "every weekday except on Monday,every weekend,before 5pm on Monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.