ci: test xcode project generation

.github/workflows/build.yml

@@ -6,28 +6,33 @@ on: [push, pull_request]
 jobs:
   build:
     if: "${{ !contains(github.event.head_commit.message, '[skip build]') }}"
-    name: ${{ matrix.config.name }}
+    name: ${{ matrix.target }} / ${{ matrix.flavor.name }}
     runs-on: "macos-12"
     strategy:
       fail-fast: false
       matrix:
-        config:
-          - {
-            name: "GZDoom"
-          }
-          - {
-            name: "Raze"
-          }
-          - {
-            name: "PrBoom-Plus"
+        target: [
+          GZDoom,
+          Raze,
+          PrBoom-Plus
+        ]
+        flavor: [
+          {
+            name: Make,
+            args: ''
+          },
+          {
+            name: Xcode,
+            args: '--xcode'
           }
+        ]
 
     steps:
       - uses: actions/checkout@v1
 
       - name: Build
         run: |
-          ./build.py --target ${{ matrix.config.name }}
+          ./build.py --target ${{ matrix.target }} ${{ matrix.flavor.args }}
 
       - name: List Build Directory
         if: always()