Continuous Integration Implementation

[Oculus049]

Issue description

Intended to solve issue #1535 by creating a CI workflow file for github actions

Solution description

Implementation of the relevant workflow file

Checklist

I have done my best to ensure that…

• [X] …I have familiarized myself with the CONTRIBUTING.md file
• [X] …this change follows the coding style and design patterns of the codebase
• [X] …I own the intellectual property rights to this code
• [X] …the intent of this change is clearly explained
• [N/A] …existing uses of the Panda3D API are not broken
• [N/A] …the changed code is adequately covered by the test suite, where possible.