Add aarch64 support

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

.github/workflows/nix.yml

@@ -18,11 +18,23 @@ jobs:
           - nixos-unstable
           - nixos-23.05
           - nixos-23.11
+        system:
+          - x86_64-linux
+          - aarch64-linux
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+      - uses: DeterminateSystems/nix-installer-action@main
+        with:
+          extra-conf: |
+            extra-platforms = aarch64-linux
+
       - run: nix-shell --run ./ci.sh
         env:
           CI_REGISTRY_AUTH: '${{ secrets.REGISTRY_AUTH }}'
           NIXPKGS_CHANNEL: '${{ matrix.channel }}'
+          NIX_SYSTEM_NAME: '${{ matrix.system }}'