Fix Python Error when running pytest in CI framework

[yardasol]

Summary of changes

This PR fixes the bug we were running into when trying to run Pytest in on GitHub actions runners.

This PR also updates the versions of the cache and checkout actions, as well as fixes OpenMC source build caching.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Required for Merging

• [x] I have read the CONTRIBUTING document.

• [x] My code follows the code style of this project.

• [ ] My change requires a change to the documentation.

  • [ ] I have updated the documentation accordingly.

• [ ] My change is a source code change

  • [ ] I have added/modified tests to cover my changes
  • [ ] I have explained why my change does not require new/modified tests

• [ ] My change is a user-facing change

  • [ ] I have recorded my changes in the changelog for the upcoming release

• [x] My change is exclusively related to the repository (e.g. GitHub actions workflows, PR/issue templates, etc.)

  • [x] I have verified or justified that my change will work as intended.
  • Non-cached run w/ openmc importing and openmc command line execution
  • Cached run w/ openmc importing and openmc command line execution

• [x] All new and existing tests passed.

  • [x] CI tests pass
  • [x] Local tests pass (including Serpent2 integration tests)

    Associated Issues and PRs

• PR: #152

• PR: #132

Associated Developers

• Dev: @munkm

Checklist for Reviewers

Reviewers should use this link to get to the Review Checklist before they begin their review.

[yardasol]

@munkm I moved the repeated shell commands to their own scripts and added inline comments. I also cleaned up some of the step names

[yardasol]

@gwenchee I think this could be really useful to helping with your CI issues in rollo