Ensure GitHub Actions Installs Python Dependencies Like Local Docker Environment

[aj-stein-nist]

Committer Notes

This resolves misalignment between the local developer env for Docker and the managed GitHub Actions for runners where the latter did not install necessary deps for the content conversion script written in Python.

This will close usnistgov/OSCAL#1216 for short-term bug fixing, and long-term improvements will be continued in subsequent systemic improvements tracked in other issues cited in the comment.

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• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you squashed any non-relevant commits and commit messages? [instructions]
• Do all automated CI/CD checks pass?

Changes to Core Features:

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[aj-stein-nist]

@david-waltermire-nist I hit some silly hiccups but this is ready to review. IMPORTANT: this took me a long time to realize, but the requirements.txt file was missing because I forgot to bring up the OSCAL repo in the submodule at ./oscal from around v1.0.0 to v1.0.2 and included this in the PR as necessary. We should have caught this prior, and had not done so yet, and seems likely minor?

@wesley-dean-gsa, can't add you as a formal reviewer. This is as the short-term quick fix for usnistgov/OSCAL#1216 before we move onto longer term enhancements.

[david-waltermire]

LGTM! Thanks!