Run most of workflow on Ubuntu 20.04, add Python 3.11

Author: mnaberez

.github/workflows/main.yml

@@ -4,67 +4,94 @@ on: [push, pull_request]
 
 jobs:
   tests:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.7, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, "3.10"]
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, "3.10", 3.11]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Show Python version
-      run: python -V
+    - name: Install dependencies
+      run: pip install virtualenv tox
+
+    - name: Set variable for TOXENV based on Python version
+      id: toxenv
+      run: python -c 'import sys; print("TOXENV=py%d%d" % (sys.version_info.major, sys.version_info.minor))' | tee -a $GITHUB_OUTPUT
 
-    - name: Set TOXENV based on Python version
-      run: python -c 'import sys; print("TOXENV=py%d%d" % (sys.version_info.major, sys.version_info.minor))' | tee -a $GITHUB_ENV
+    - name: Run the unit tests
+      run: TOXENV=${{steps.toxenv.outputs.TOXENV}} tox
+
+    - name: Run the end-to-end tests
+      run: TOXENV=${{steps.toxenv.outputs.TOXENV}} END_TO_END=1 tox
+
+  tests_ubuntu_1804:
+    runs-on: ubuntu-18.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.4]  # not supported by setup-python on ubuntu 20.04
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: pip install virtualenv tox
 
+    - name: Set variable for TOXENV based on Python version
+      id: toxenv
+      run: python -c 'import sys; print("TOXENV=py%d%d" % (sys.version_info.major, sys.version_info.minor))' | tee -a $GITHUB_OUTPUT
+
     - name: Run the unit tests
-      run: tox
+      run: TOXENV=${{steps.toxenv.outputs.TOXENV}} tox
 
     - name: Run the end-to-end tests
-      run: END_TO_END=1 tox
+      run: TOXENV=${{steps.toxenv.outputs.TOXENV}} END_TO_END=1 tox
 
   coverage:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.7, 3.7]
+        python-version: [2.7, 3.8]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: pip install virtualenv tox
 
-    - name: Set TOXENV based on Python version
-      run: python -c 'import sys; e="cover" if sys.version_info.major == 2 else "cover3"; print("TOXENV=%s" % e)' | tee -a $GITHUB_ENV
+    - name: Set variable for TOXENV based on Python version
+      id: toxenv
+      run: python -c 'import sys; e="cover" if sys.version_info.major == 2 else "cover3"; print("TOXENV=%s" % e)' | tee -a $GITHUB_OUTPUT
 
     - name: Run unit test coverage
-      run: tox
+      run: TOXENV=${{steps.toxenv.outputs.TOXENV}} tox
 
   docs:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: "3.8"