use nix in github action

.github/workflows/rust.yml

@@ -12,35 +12,23 @@ env:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: macos-12
 
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-node@v3
+    - uses: cachix/install-nix-action@v22
       with:
-        node-version: 18
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
+        nix_path: nixpkgs=channel:nixos-unstable
     - name: Build
       working-directory: app/
-      run: |
-        cargo build
-        cargo install trunk
+      run: nix-shell --run "node --version && cargo build"
     - name: Run tests
       working-directory: app/
-      run: cargo test --verbose
+      run: nix-shell --run "cargo test"
     - name: Npm install
       working-directory: app/
-      run: npm install
-    - name: Install playwright deps
+      run: nix-shell --run "npm install"
+    - name: Install playwright deps and run tests
       working-directory: app/
-      run: npx playwright install --with-deps
-    - name: Run playwright tests
-      working-directory: app/
-      run: |
-        rustup target add wasm32-unknown-unknown
-        npx playwright test
-    - uses: actions/upload-artifact@v3
-      if: always()
-      with:
-        name: playwright-report
-        path: playwright-report/
-        retention-days: 30
+      run: nix-shell --run "node --version && npx playwright install --with-deps && npx playwright test"

app/flake.nix

@@ -28,6 +28,7 @@
             cacert
             cargo-make
             trunk
+            nodejs_18
             (rust-bin.selectLatestNightlyWith( toolchain: toolchain.default.override {
               extensions= [ "rust-src" "rust-analyzer" ];
               targets = [ "wasm32-unknown-unknown" ];