Install HDF5 on macos-latest

Author: pgleeson

.github/workflows/main.yml

@@ -34,6 +34,12 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools wheel
         python -m pip install tox tox-gh-actions
+    
+    - name: Install HDF5 on macos-latest
+      if: ${{ matrix.runs-on == 'macos-latest' }}
+      run: |
+        brew install hdf5
+
     - name: Test with tox
       run:
         tox --