Add cache

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: "Build"
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v27
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+    - uses: cachix/cachix-action@v15
+      with:
+        name: wires
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: nix flake check
+    - run: nix build

.github/workflows/test-templates.yml

@@ -10,6 +10,9 @@ jobs:
     - uses: cachix/install-nix-action@v27
       with:
         nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          trusted-public-keys = wires.cachix.org-1:7XQoG91Bh+Aj01mAJi77Ui5AYyM1uEyV0h1wOomqjpk= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+        substituters = https://wires.cachix.org https://cache.nixos.org/
     - name: Build
       working-directory: ./templates/nightly
       run: nix build .#neovim --override-input tolerable ../../.