Revert "[testing] [ci] Focus on Windows (since that's where test flak…

…iness was seen for sphinx-doc#11232) and run a broader matrix of Python versions"

This reverts commit 647df0a.

.github/workflows/main.yml

@@ -16,9 +16,9 @@ env:
   PYTHONWARNINGS: "error"  # default: all warnings as errors
 
 jobs:
-  windows:
-    runs-on: windows-2019
-    name: Python ${{ matrix.python }} (Docutils ${{ matrix.docutils }}) (Windows)
+  ubuntu:
+    runs-on: ubuntu-latest
+    name: Python ${{ matrix.python }} (Docutils ${{ matrix.docutils }})
     strategy:
       fail-fast: false
       matrix:
@@ -36,8 +36,20 @@ jobs:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python }}
       uses: actions/setup-python@v4
+      if: "!endsWith(matrix.python, '-dev')"
       with:
         python-version: ${{ matrix.python }}
+    - name: Set up Python ${{ matrix.python }} (deadsnakes)
+      uses: deadsnakes/action@v2.1.1
+      if: "endsWith(matrix.python, '-dev')"
+      with:
+        python-version: ${{ matrix.python }}
+      env:
+        PYTHONWARNINGS: ""
+    - name: Check Python version
+      run: python --version
+    - name: Install graphviz
+      run: sudo apt-get install graphviz
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
@@ -50,3 +62,49 @@ jobs:
         PYTHONWARNINGS: ""
     - name: Test with pytest
       run: python -m pytest -vv --durations 25
+
+  windows:
+    runs-on: windows-2019
+    name: Windows
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install .[test]
+      env:
+        PYTHONWARNINGS: ""
+    - name: Test with pytest
+      run: python -m pytest -vv --durations 25
+
+  docutils-latest:
+    runs-on: ubuntu-latest
+    name: Docutils HEAD
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3"
+    - name: Check Python version
+      run: python --version
+    - name: Install graphviz
+      run: sudo apt-get install graphviz
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install .[test]
+      env:
+        PYTHONWARNINGS: ""
+    - name: Install Docutils' HEAD
+      run: python -m pip install git+https://repo.or.cz/docutils.git\#subdirectory=docutils
+      env:
+        PYTHONWARNINGS: ""
+    - name: Test with pytest
+      run: python -m pytest -vv