CI: Add Python 3.12 tests with native setup

Author: effigies

.github/workflows/test.yml

@@ -23,17 +23,25 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["2.7", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
         requires: ["", "requirements.txt"]
 
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python ${{ matrix.python-version }} (native)
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+        if: matrix.python-version > 3.8
+      - 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
       - name: Check environment
         run: |
           which python