install msvc for Windows

Author: TymianekPL

.github/workflows/cmake.yml

@@ -55,6 +55,12 @@ jobs:
           fi
         shell: bash
 
+      - name: Setup MSVC environment
+        if: matrix.os == 'windows-latest'
+        uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: x64
+
       - name: Configure CMake
         run: |
           mkdir build
@@ -65,10 +71,8 @@ jobs:
             fi
           elif [ "${{ matrix.os }}" == "windows-latest" ]; then
             if [ "${{ matrix.compiler }}" == "msvc" ]; then
-              # Force the real MSVC toolset (cl.exe)
               cmake -G "Visual Studio 17 2022" -A x64 ..
             elif [ "${{ matrix.compiler }}" == "clang" ]; then
-              # Explicit clang-cl on Windows
               cmake -G Ninja -DCMAKE_CXX_COMPILER=clang-cl ..
             fi
           fi