CI: Use arrays to indicate conda or native setup

Author: effigies

.github/workflows/test.yml

@@ -25,7 +25,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python:
+          - ["conda", "2.7"]
+          - ["conda", "3.6"]
+          - ["conda", "3.7"]
+          - ["native", "3.8"]
+          - ["native", "3.9"]
+          - ["native", "3.10"]
+          - ["native", "3.11"]
+          - ["native", "3.12"]
         requires: ["", "requirements.txt"]
 
     steps:
@@ -34,14 +42,14 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }} (native)
         uses: actions/setup-python@v4
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: ${{ matrix.python[1] }}
           allow-prereleases: true
-        if: matrix.python-version > 3.8
+        if: matrix.python[0] == 'native'
       - name: Set up Python ${{ matrix.python-version }} (miniconda)
         uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: ${{ matrix.python-version }}
-        if: matrix.python-version <= 3.8
+          python-version: ${{ matrix.python[1] }}
+        if: matrix.python[0] == 'conda'
       - name: Check environment
         run: |
           which python