Add GitHub Action to cleanup stale branches

[miha42-github]

Introduction

Since the default behaviors of the system are to generate new branches for every create, update and delete operation without some caretaking the number of branches will grow infinitely. This issue will create a GitHub action that prunes the number of branches to a defined count of 15.

Implementation notes

• The action should counts the number of branches, subtracts out any nonnumerical branch names like main, to create a candidate list.
• Branches should be pruned to match the defined count of 15 or less.
• The action should run everyday at 12AM.
• The action should be installed during the CLI setup

[miha42-github]

The action has been built and tested within the discovery repository. It is called prune-branches and is located in the .github directory. This means the next step is to move the action into the SDK and then test the installation.

[miha42-github]

Action created and operable