Attempt 2 to get CI working on Mac

.github/workflows/CI.yaml

@@ -40,12 +40,12 @@ jobs:
           environment-name: red
           create-args: >- # beware the >- instead of |, we don't split on newlines but on spaces
             python=${{ matrix.python-version }}
-          init-shell: true # Required for the make commands to work on Mac
 
       - name: Install package
         # conda setup requires this special shell
         shell: bash -l {0}
         run: |
+          micromamba install -y -n red -c conda-forge -c defaults git make
           apt update && apt install -y git make
           python -m pip install . --no-deps
           micromamba list