Add workflows for use by other repos

[jonathan-winn-geo]

See

• https://docs.github.com/en/actions/using-workflows/reusing-workflows
• https://medium.com/@er.singh.nitin/how-to-share-the-github-actions-workflow-in-an-organization-privately-c3bb3e0deb3
• https://docs.github.com/en/actions/using-workflows/sharing-workflows-secrets-and-runners-with-your-organization
• https://docs.github.com/en/enterprise-cloud@latest/actions/creating-actions/sharing-actions-and-workflows-with-your-enterprise

[jonathan-winn-geo]

split or extend to sub issues for ease of working