switch to cachix for CI

Author: Mic92

.github/workflows/ci.yml

@@ -18,22 +18,38 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v30
-      - uses: DeterminateSystems/magic-nix-cache-action@v9
-      - run: nix run github:Mic92/nix-fast-build -- --no-nom
+      - uses: cachix/cachix-action@v15
+        with:
+          name: nixos-infra-dev
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix run --inputs-from . nixpkgs#nix-fast-build -- --skip-cached --no-nom
   # all builds combined consume too much disk space... we should soon switch to something else
-  nixos:
+  nixos-x86_64:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # we actually cannot build umbriel just now
-        # but it also looks like it doesn't run important stuff
-        #machine: [caliban, umbriel]
         machine: [caliban]
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v30
-      - uses: DeterminateSystems/magic-nix-cache-action@v9
-      - run: nix build '.#nixosConfigurations."${{ matrix.machine }}.nixos.org".config.system.build.toplevel'
+      - uses: cachix/cachix-action@v15
+        with:
+          name: nixos-infra-dev
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix run --inputs-from . nixpkgs#nix-fast-build -- --skip-cached --no-nom --flake '.#nixosConfigurations."${{ matrix.machine }}.nixos.org".config.system.build.toplevel'
+  nixos-aarch64:
+    runs-on: ubuntu-22.04-arm
+    strategy:
+      matrix:
+        machine: [umbriel]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - uses: cachix/cachix-action@v15
+        with:
+          name: nixos-infra-dev
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix run --inputs-from . nixpkgs#nix-fast-build -- --skip-cached --no-nom --flake '.#nixosConfigurations."${{ matrix.machine }}.nixos.org".config.system.build.toplevel'
   nix-darwin:
     runs-on: macos-latest
     strategy:
@@ -42,5 +58,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v30
-      - uses: DeterminateSystems/magic-nix-cache-action@v9
-      - run: nix build '.#darwinConfigurations."${{ matrix.machine }}".config.system.build.toplevel'
+      - uses: cachix/cachix-action@v15
+        with:
+          name: nixos-infra-dev
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - run: nix run --inputs-from . nixpkgs#nix-fast-build -- --skip-cached --no-nom --flake '.#darwinConfigurations."${{ matrix.machine }}".config.system.build.toplevel'