CI: install fmtlib on Windows

Signed-off-by: Pavel Artsishevsky <polter.rnd@gmail.com>

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

@@ -55,10 +55,14 @@ jobs:
       run: |
         echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
-    - name: Install dependencies
+    - name: Install dependencies (Linux)
       if: runner.os == 'Linux'
       run: sudo apt-get install -y libfmt-dev clang-tidy clang-format cmake-format cppcheck iwyu
 
+    - name: Install dependencies (Windows)
+      if: runner.os == 'Windows'
+      run: vcpkg install fmt
+
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
@@ -70,6 +74,7 @@ jobs:
         -DENABLE_FORMATTERS=ON
         -DENABLE_SANITIZERS=ON
         -DENABLE_FMTLIB=${{ matrix.format_lib == 'fmtlib' && 'ON' || 'OFF' }}
+        -DCMAKE_TOOLCHAIN_FILE=${{ env.VCPKG_INSTALLATION_ROOT }}\scripts\buildsystems\vcpkg.cmake
         -S ${{ github.workspace }}
 
     - name: Check formatting