From 0225cde1d95f9f426e6b9d326b24c78a7181d05e Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Fri, 6 Feb 2026 17:51:08 +0100
Subject: [PATCH] CI: try with magic-nix-cache-action.

---
 .github/workflows/ci.yml | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7270a2e33..2ce4a1b06 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -147,12 +147,8 @@ jobs:
     - uses: wimpysworld/nothing-but-nix@v9
       with:
         hatchet-protocol: 'rampage'
-    - uses: cachix/install-nix-action@v31
-      with:
-        nix_path: nixpkgs=channel:nixos-unstable
-        nix_conf: |
-          keep-env-derivations = true
-          keep-outputs = true
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
     - name: Cache cabal work
       id:   cabal-local
       uses: actions/cache@v5