feat(CI): use a Ubuntu 20.04 container to build

Author: Xmader

.github/workflows/test-and-publish.yaml

@@ -69,6 +69,7 @@ jobs:
                                                                            # see https://github.blog/changelog/2024-01-30-github-actions-macos-14-sonoma-is-now-available
         python_version: [ '3.10' ]
     runs-on: ${{ matrix.os }}
+    container: ${{ (matrix.os == 'ubuntu-22.04' && 'ubuntu:20.04') || null }} # Use the Ubuntu 20.04 container inside Ubuntu 22.04 runner to build
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5