Adding GitHub-Action CI Option

[arnav13081994]

Description

Adding an option to let users choose GitHub action as a CI tool.

Checklist:

• I've made sure that tests/test_cookiecutter_generation.py is updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

Since this code repo is on Github it would make more sense to take advantage of the deep CI integration that GitHub now provides out of the box like dependency caching to speed up future builds.

[arnav13081994]

@browniebroke I am having trouble understanding why the checks are failing. Looks like project_generation is exiting with code 1. I have updated the tests etc but don't understand why this is happening. Any help would be appreciated.

[browniebroke]

I think the issues might have to do with Jinja2 trying to interpolate GH actions variables (see below).