Merge Docutils master tests into the main workflow

.github/workflows/docutils-latest.yml

@@ -1,29 +0,0 @@
-name: Test with the HEAD of docutils
-
-on:
-  schedule:
-  - cron: "0 0 * * SUN"
-  workflow_dispatch:
-
-permissions:
-  contents: read
-
-jobs:
-  test:
-    if: github.repository_owner == 'sphinx-doc'
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python
-      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: pip install -U tox codecov
-    - name: Run Tox
-      run: tox -e du-latest -- -vv

.github/workflows/main.yml

@@ -25,6 +25,7 @@ jobs:
         docutils:
         - "du18"
         - "du19"
+        - "du-latest"
 
     steps:
     - uses: actions/checkout@v3