Breaking changes to codecov-action means CODECOV_TOKEN needs to be set on open repos.

actions-workflow.yml

name: API workflow

on: [push, pull_request]

jobs:
  build:
    runs-on: macos-latest
    name: Test python API
    steps:
      - name: Checkout
        uses: actions/checkout@master

      - name: Set up Python 3.12.1
        uses: actions/setup-python@v4
        with:
          python-version: '3.12.1'

      - name: Install dependencies
        run: pip install -r requirements.txt

      - name: Run tests and collect coverage
        run: |
          coverage run -m pytest
          coverage xml

      - uses: codecov/codecov-action@v4
        with:
          fail_ci_if_error: true # optional (default = false)
          files: ./coverage.xml # optional
          flags: unittests # optional
          name: codecov-umbrella # optional
          token: ${{ secrets.CODECOV_TOKEN }} # required
          verbose: true # optional (default = false)