TODO add Cpython 2.7 testing for Ubuntu GitHub Workflow Actions

[clach04]

For background see #59

Idea, adopt change arthurdejong/python-pskc@9ce2424 - viz. add a new ubuntu CPython 2.7 job, and leave existing matrix alone (i.e. no conditional, so means some duplication):

jobs:
  base_py27:
    runs-on: ubuntu-20.04
    container:
      image: python:2.7.18-buster
    strategy:
      fail-fast: false
      matrix:
        python-version: [2.7]
        flavour: [signxml, legacy, legacy-defusedxml, lxml, lxml-defusedxml]
    steps:
      - uses: actions/checkout@v3
      - name: Install dependencies
        run: python -m pip install --upgrade pip virtualenv tox
      - name: Install development libraries
        if: "${{ startsWith(matrix.python-version, 'pypy') }}"
        run: sudo apt-get update && sudo apt-get install -y libxml2-dev libxslt-dev
      - name: Run tox
        run: tox -e "$(echo py${{ matrix.python-version }}-${{ matrix.flavour }} | sed -e 's/[.]//g;s/pypypy/pypy/')" --skip-missing-interpreters false
  base:
    runs-on: ubuntu-20.04
    strategy:
      fail-fast: false
      matrix:
        #python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, '3.10', 3.11, pypy2.7, pypy3.8, pypy3.9]  # REMOVED
        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, '3.10', 3.11, pypy2.7, pypy3.8, pypy3.9]

[clach04]

Also check out https://github.com/coatl-dev/docker-six

[clach04]

https://github.com/dateutil/dateutil/blob/0586f4afa26fc6799128d98d4f97a49c7d6ab314/.github/workflows/validate.yml#L39-L56
...
include:
- python-version: "2.7"
os: "ubuntu-20.04"
- python-version: "3.5"
os: "ubuntu-20.04"
- python-version: "3.6"
os: "ubuntu-20.04"
runs-on: ${{ matrix.os }}
env:
TOXENV: py
steps:
- uses: actions/checkout@v3
- if: ${{ matrix.python-version == '2.7' }}
run: |
sudo apt-get install python-is-python2
curl -sSL https://bootstrap.pypa.io/pip/2.7/get-pip.py -o get-pip.py
python get-pip.py
name: Set up Python ${{ matrix.python-version }} on ${{ matrix.os }}
- if: ${{ matrix.python-version != '2.7' }}
name: Set up Python ${{ matrix.python-version }} on ${{ matrix.os }}
uses: actions/setup-python@v3
with:
python-version: ${{ matrix.python-version }}
...

[clach04]

https://github.com/LizardByte/setup-python-action