ci: build benchmarks

.github/workflows/test.yml

@@ -40,6 +40,25 @@ jobs:
       - name: Test Build
         run: nix develop -c zig build -Dstatic=true -Dapp-runtime=glfw -Dtarget=${{ matrix.target }}
 
+  build-bench:
+    runs-on: namespace-profile-ghostty-md
+    needs: test
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      # Install Nix and use that to run our tests so our environment matches exactly.
+      - uses: cachix/install-nix-action@v24
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v14
+        with:
+          name: ghostty
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Build Benchmarks
+        run: nix develop -c zig build -Dapp-runtime=glfw -Demit-bench
+
   build-linux-libghostty:
     runs-on: namespace-profile-ghostty-md
     needs: test