Further ci_corrections

[williamjameshandley]

Description

Further CI corrections following #22 and #23. We need to checkout to get a version number to poll pypi

Checklist:

• I have performed a self-review of my own code
• My code is black compliant (black . --check)
• My code is isort compliant (isort . --profile black --filter-files)
• My code contains compliant docstrings (pydocstyle --convention=numpy lsbi)
• New and existing unit tests pass locally with my changes (python -m pytest)
• I have added tests that prove my fix is effective or that my feature works
• I have appropriately incremented the semantic version number in both README.rst and lsbi/_version.py