ci: Pin Nix to 2.18.9

2.24 has showstopper regressions that causes Melpa updates to fail
nix-community · Nov 3, 2024 · c9f00a7 · c9f00a7
1 parent 0cfc0c5
commit c9f00a7
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diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -18,6 +18,7 @@ jobs:
       uses: cachix/install-nix-action@v30
       with:
         nix_path: nixpkgs=channel:nixos-unstable
+        install_url: https://releases.nixos.org/nix/nix-2.18.9/install
 
     - name: Add nix-community cache
       uses: cachix/cachix-action@v15
@@ -56,6 +57,7 @@ jobs:
       uses: cachix/install-nix-action@v30
       with:
         nix_path: nixpkgs=channel:nixos-unstable
+        install_url: https://releases.nixos.org/nix/nix-2.18.9/install
 
     - name: Add nix-community cache
       uses: cachix/cachix-action@v15

diff --git a/.github/workflows/pulls.yml b/.github/workflows/pulls.yml
@@ -12,6 +12,9 @@ jobs:
     steps:
       - uses: actions/[email protected]
       - uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          install_url: https://releases.nixos.org/nix/nix-2.18.9/install
       - id: set-matrix
         name: Evaluate flake
         run: nix flake show --all-systems