Install ninja on Windows

.github/workflows/cmake-multi-platform.yml

@@ -82,6 +82,11 @@ jobs:
       run: brew install ninja
       if: runner.os == 'macOS'
 
+    - name: Install ninja (Windows)
+      shell: bash
+      run: choco install ninja
+      if: runner.os == 'Windows'
+
     - name: Install dependencies
       if: matrix.os == 'ubuntu-latest'
       run: sudo apt-get update && sudo apt-get install -y libglfw3-dev libglm-dev ninja-build
@@ -105,7 +110,7 @@ jobs:
 
     - name: Build
       # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
-      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} -j3
+      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} -j
 
     - name: Stage binary for release
       shell: bash