Docker Compose support

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**Tell us about your request**
I would like to deploy services from a docker-compose file when using source control based deployments.

**Describe alternatives you've considered**
Use CodePipeline to push to ECR with docker compose build and create an App Runner registry based deployment for each one.

**Additional context**
I'm wondering how this would work since an App Runner service is meant to be just that, a single service. There would need to be a higher level to represent a project or something if we could deploy multiple services from a single source control based deployment.

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