Another try.

.github/workflows/gh_actions_ci.yml

@@ -127,6 +127,7 @@ jobs:
         shell: pwsh
         run: |
           conda install -y python=3.10 git pybind11 numpy cmake 'llvmdev=18.*' tbb-devel tbb astroquery libboost-devel fmt spdlog sleef sympy cloudpickle zlib libzlib 'mppp=1.*' numba
+          call "C:\Program Files (x86)\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           git clone --depth 1 https://github.com/bluescarni/heyoka.git heyoka_cpp
           cd heyoka_cpp
           mkdir build