Try using conda-pypi to install dependencies on MacOS

Author: matt-graham

.github/workflows/tests.yml

@@ -41,18 +41,20 @@ jobs:
         fetch-tags: true
 
     - if: matrix.os == 'macos-latest'
-      name: Set up Miniforge
+      name: Set up Miniforge on MacOS
       uses: conda-incubator/setup-miniconda@v3
       with:
         miniforge-version: latest
         python-version: ${{ matrix.python-version }}
 
     - if: matrix.os == 'macos-latest'
-      name: Install pytorch and healpy with conda on MacOS
+      name: Install dependencies with conda on MacOS
       # Avoid OpenMP runtime incompatibility when using PyPI wheels
       # https://github.com/healpy/healpy/issues/1012
-      run: conda install pytorch healpy
-
+      run: |
+        conda install conda-pypi
+        conda pip install ".[tests]"
+  
     - if: matrix.os != 'macos-latest'
       name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5