chore(cla): include cla signing utility

[JamesMonk]

---

title: "pr: Include new CLA signing utility "
labels: "Pull request"

Description

Incorporating this action into the repo will allow for fulfilling Legal's requirement that all external contributors sign a Contributor License Agreement as part of their contribution, without forcing the contributor to resort to the use of printers, pens and faxes to transmit their signature.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[LunarEngineerSF]

I see the changes; they appear to be pretty straightforward.