new CI run for macOS portable app bundle

.github/workflows/ci.yml

@@ -173,7 +173,36 @@ jobs:
         uses: actions/upload-artifact@v2-preview
         with:
           name: "OpenRCT2-macOS-cmake"
-          path: artifacts
+          path: artifacts/OpenRCT2-MacOS-x64-cmake.tar.gz
+  macos-cmake-portable:
+    name: macOS (x64, portable) using CMake
+    runs-on: macos-latest
+    needs: [check-code-formatting]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1
+        with:
+          key: macos
+      - name: Build OpenRCT2
+        run: |
+          brew install ninja
+          . scripts/setenv -q && build -DCMAKE_BUILD_TYPE=MinSizeRel -DBUILD_SHARED_LIBS=on -DMACOS_BUNDLE=on
+      - name: Build artifacts
+        shell: bash
+        run:  |
+          . scripts/setenv
+          mkdir -p artifacts
+          mv bin/OpenRCT2.app artifacts
+          echo -e "\033[0;36mCompressing OpenRCT2.app...\033[0m"
+          cd artifacts
+          zip -rq openrct2-macos-cmake-app.zip OpenRCT2.app
+      - name: Upload artifacts (CI)
+        uses: actions/upload-artifact@v2-preview
+        with:
+          name: "OpenRCT2-macOS-cmake-app"
+          path: artifacts/openrct2-macos-cmake-app.zip 
 
   linux-portable:
     name: Linux (x64, portable)