[phast3] Added CONDA_PREFIX env var

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

@@ -74,6 +74,10 @@ jobs:
         cache-environment: true
         post-cleanup: 'all'
 
+    - name: Set CONDA_PREFIX
+      shell: bash
+      run: echo "CONDA_PREFIX=${{ env.MAMBA_ROOT_PREFIX }}\envs\phast-dev" >> "$GITHUB_ENV"
+
     - 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