ci: add renderer, font engine macOS build+test matrix

.github/workflows/test.yml

@@ -172,6 +172,41 @@ jobs:
           cd macos
           xcodebuild -target Ghostty-iOS "CODE_SIGNING_ALLOWED=NO"
 
+  build-macos-matrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        renderer: [opengl, metal]
+
+        font_backend:
+          [
+            freetype,
+            coretext,
+            coretext_freetype,
+            coretext_harfbuzz,
+            coretext_noshape,
+          ]
+    runs-on: namespace-profile-ghostty-macos
+    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@v26
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v14
+        with:
+          name: ghostty
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Test
+        run: nix develop -c zig build test -Dapp-runtime=glfw -Drenderer=${{ matrix.renderer }} -Dfont-backend=${{ matrix.font_backend }}
+
+      - name: Build
+        run: nix develop -c zig build -Dapp-runtime=glfw -Drenderer=${{ matrix.renderer }} -Dfont-backend=${{ matrix.font_backend }}
+
   build-windows:
     runs-on: windows-2019
     # this will not stop other jobs from running