CI/CD configuration examples

[leonardbinet]

It would be a nice improvement to provide configuration examples with documentation for some common CI/CD use cases.

For instance, configuration files for CircleCI or Github actions that would:

• on pull-request creation: would spawn a platform and run all integration and end-to-end tests
• on merge on staging branch would deploy changes to preproduction environment
• on merge on main/master branch would deploy changes to production environment

If interest is confirmed, I could provide an example for CircleCI.

(btw thanks a lot for this repository ❤️ it's the best ressource I've found on making terraform and serverless work together in a proper way)