title: Trigger specific AWS Codepipeline source stage when change is made to a specific directory in repo
body: <p>I have a number of services in a single GitHub repository, each service has its own CodePipeline on AWS managed through Terraform. Instead of triggering all of the pipelines on commit, I'd like to know how I can trigger each service's pipeline if its directory had any changes on commit, without having to split the services each into its own repository.</p>