Fix vcpkg on CI until github actions runners rollbacked

Make the path to the vcpkg executable explicit to avoid relying on VCPKG_ROOT which had been changed (and then reverted) on github actions runners, see actions/runner-images#6376

.github/workflows/build.yml

@@ -5,7 +5,7 @@ on: [push]
 env:
  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
  BUILD_TYPE: Release
- VCPKG_VERSION: 14e7bb4ae24616ec54ff6b2f6ef4e8659434ea44
+ VCPKG_VERSION: 94ce0dab56f4d8ba6bd631ba59ed682b02d45c46
 
 jobs:
  Linux:
@@ -48,8 +48,8 @@ jobs:
  with: 
  committish: ${{ env.VCPKG_VERSION }}
  - name: Run vcpkg
- shell: bash
- run: vcpkg install opengl glui glew cgal openblas eigen3 intel-mkl
+ run: |
+  ${{github.workspace}}/vcpkg/vcpkg install opengl glui glew cgal openblas eigen3 intel-mkl
  - name: Configure CMake
  env:
  CC: clang
@@ -59,7 +59,7 @@ jobs:
  run: |
  mkdir build
  cd build
- cmake -G Ninja -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake -DMKL_DIR=/opt/intel/oneapi/mkl/latest/lib/cmake/mkl/ -S ../ -B ./
+ cmake -G Ninja -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=${{github.workspace}}/vcpkg/scripts/buildsystems/vcpkg.cmake -DMKL_DIR=/opt/intel/oneapi/mkl/latest/lib/cmake/mkl/ -S ../ -B ./
  - name: Build
  # Build your program with the given configuration
  run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
@@ -113,7 +113,7 @@ jobs:
  REM call "C:\Program Files (x86)\Intel\oneAPI\setvars.bat"
  set "MKL_DIR=C:\Program Files (x86)\Intel\oneAPI\mkl\2022.0.3\lib\cmake\mkl"
  vcpkg.exe install intel-mkl 
- vcpkg.exe install opengl glui glew cgal openblas eigen3 
+ ${{github.workspace}}\vcpkg\vcpkg.exe install opengl glui glew cgal openblas eigen3 intel-mkl
  - name: Setup MSVC
  uses: ilammy/msvc-dev-cmd@v1
  - name: Configure CMake