Another attempt to fix workflow

.github/workflows/build_pip.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     defaults:
       run:
-         shell: bash -l {0}
+         shell: bash -el {0}
 
     strategy:
       matrix:
@@ -34,32 +34,27 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v3
         with:
           auto-activate-base: true
-          use_mamba: true
+          use-mamba: true
           mamba-version: "*"
           channels: conda-forge
           activate-environment: true
           python-version: ${{ matrix.python }}
 
-      - name: Initialize mamba
-        run: mamba init
-
       - name: Install MKL
         run: |
-          mamba install -c conda-forge mkl-devel mkl-service --override-channels
-          mamba activate
+          conda install -c conda-forge mkl-devel mkl-service --override-channels
+          conda activate
           python -c "import sys; print(sys.executable)"
           which python
           python -c "import mkl; print(mkl.__file__)"
 
       - name: Build conda package
         run: |
-          mamba activate
+          conda activate
           pip install --no-cache-dir cython pytest hypothesis
           pip install --no-cache-dir numpy ${{ matrix.use_pre }}
-          mamba info --system --json > system_info.json
-          export MY_PREFIX=$(jq -r '.conda_prefix' system_info.json)
-          echo "MY_PREFFIX is '${MY_PREFIX}'"
-          export MKLROOT=${MY_PREFIX}
+          echo "CONDA_PREFFIX is '${CONDA_PREFIX}'"
+          export MKLROOT=${CONDA_PREFIX}
           pip install -e . --no-build-isolation --verbose --no-deps
           export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${MKLROOT}/lib
           python -m pytest -v mkl_fft/tests/test_fft1d.py mkl_fft/tests/test_fftnd.py