fix CI

Author: nychiang

Diff for: .github/workflows/test_hiopbbpy.yml

@@ -23,7 +23,8 @@ jobs:
 
       - name: Install IPOPT and HiOpBBPy
         run: |
-          conda install -c conda-forge ipopt cyipopt pkg-config
+          conda activate test
+          conda install -c conda-forge cyipopt
           export LD_LIBRARY_PATH=$CONDA_PREFIX/lib:$LD_LIBRARY_PATH
           python -m pip install --upgrade pip
           pip install .