Use Rosetta, macos-latest

Author: dmjio

.github/workflows/ci.yml

@@ -12,16 +12,29 @@ jobs:
   build:
     strategy:
       matrix:
-        # macos-13 is the last x86_64 runner; ArrayFire only ships an x86_64
-        # macOS binary, so the flake has no aarch64-darwin (macos-latest) build.
-        os: [ubuntu-latest, macos-13]
+        os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
 
+      # macos-latest is Apple Silicon, but ArrayFire only ships an x86_64 macOS
+      # binary, so the flake's darwin output is x86_64-darwin. Build it under
+      # Rosetta 2: ensure Rosetta is present and let Nix build x86_64-darwin
+      # derivations via `extra-platforms` below.
+      - name: Install Rosetta 2
+        if: runner.os == 'macOS'
+        run: softwareupdate --install-rosetta --agree-to-license
+
       - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixpkgs-unstable
+          extra_nix_config: |
+            extra-platforms = x86_64-darwin
 
-      - name: Build and run tests
+      - name: Build and run tests (Linux)
+        if: runner.os == 'Linux'
         run: nix build -L
+
+      - name: Build and run tests (macOS, x86_64 via Rosetta)
+        if: runner.os == 'macOS'
+        run: nix build -L .#packages.x86_64-darwin.default