Add Ninja generator test to CI

Author: o01eg

.github/workflows/ci.yml

@@ -92,6 +92,39 @@ jobs:
           cmake -G "Visual Studio 16 2019" -T v142 -A x64 -DCMAKE_C_FLAGS=/MP -DCMAKE_CXX_FLAGS=/MP -DCMAKE_BUILD_TYPE=Release .
           cmake --build . --config "Release" -- /maxcpucount /property:BuildInParallel=true /property:CL_MPCount=2 /verbosity:minimal
 
+  windows-msvc-cmake-ninja:
+    name: Build (Windows, MSVC, CMake+Ninja)
+    runs-on: windows-2019
+    steps:
+      - name: Checkout
+        uses: actions/[email protected]
+        with:
+          submodules: recursive
+
+      - name: Set up Python (for binding generator)
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.9.1'
+
+      - uses: seanmiddleditch/gha-setup-ninja@master
+
+      - name: Uninstall GCC
+        run: |
+          choco list --local-only
+          choco uninstall mingw strawberryperl -y --remove-dependencies
+
+      - name: Add msbuild to PATH
+        uses: microsoft/[email protected]
+        with:
+          vs-version: '[16.0,16.10)'
+
+      - name: Build godot-cpp
+        run: |
+          set CC=cl
+          # MSVS generator supports multiple configurations but godot-cpp CMake requires CMAKE_BUILD_TYPE
+          cmake -G Ninja -DCMAKE_C_FLAGS=/MP -DCMAKE_CXX_FLAGS=/MP -DCMAKE_BUILD_TYPE=Release .
+          cmake --build . --config "Release"
+
   windows-mingw:
     name: Build (Windows, MinGW)
     runs-on: windows-2019