Cloudformation git-sync

[CaptainCarpensir]

Copilot uses pipelines to handle an automated release process. This follows a git branch and runs a deployment on push to the branch. A newly released alternative to AWS CodePipeline is the Cloudformation Git-sync feature. Copilot could potentially make use of this feature. This would require research into git sync, comparing what it can do with what copilot already uses, and then implementing support.