PSCE-256 - Add create-cd GitHub Action

[jpower432]

Description

Follow on PR to #67

This the action.yml, documentation, and bash entrypoint script.
Updates the Dockerfile to combine RUN directives to reduce image layers.

TODO: Add an issue to address duplicate of logic in bash and in README.md files.

Type of change

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

How has this been tested?

• Integration testing

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

[beatrizmcouto]

Paired code review on October 26