ci: Use OS-specific conda environment files in GitHub Actions workflows

Author: czgdp1807

.github/workflows/conda-build.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Setup Micromamba
       uses: mamba-org/setup-micromamba@v1
       with:
-        environment-file: ci/environment.yml
+        environment-file: ${{ matrix.os == 'macos-latest' && 'ci/environment-macos.yml' || 'ci/environment.yml' }}
         cache-environment: true
         create-args: >-
           python=${{ matrix.python-version }}

.github/workflows/conda-test.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Setup Micromamba
       uses: mamba-org/setup-micromamba@v1
       with:
-        environment-file: ci/environment.yml
+        environment-file: ${{ matrix.os == 'macos-latest' && 'ci/environment-macos.yml' || 'ci/environment.yml' }}
         cache-environment: true
         create-args: >-
           python=${{ matrix.python-version }}