chore: add devenv tests

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: "Test"
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+
+    # Use exact commit IDs instead of versions as recommended by Github
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: cachix/install-nix-action@4eae8bea4afaa8f8ea8aa638ab9a7fead2f3d21e # v31
+      - uses: cachix/cachix-action@97e5ff84d02b3b4f9936339f767e17f03c9252ed # v16
+        with:
+          name: devenv
+      - name: Install devenv.sh
+        run: nix profile add nixpkgs#devenv
+
+      # Required for the npm-format hook
+      - name: Install npm dependencies
+        # Run inside the devenv shell to use the correct node version
+        run: devenv shell -- bash -c 'cd app && npm install'
+
+      - name: Build the devenv shell and run any pre-commit hooks
+        run: devenv test

devenv.nix

@@ -35,7 +35,7 @@
       fi
 
       cd "${config.git.root}/app"
-      npm run format
+      npx prettier --write .
     '';
   };
 in {
@@ -82,4 +82,8 @@ in {
       cwd = "${config.git.root}/app";
     };
   };
+
+  enterTest = ''
+    node --version | grep -Fx "v${pkgs.nodejs_latest.version}"
+  '';
 }