start.sh should be able to start services selectively

[mattheworris]

Description

As a developer or builder/consumer of gateway services, I want to be able to start only the services that I am interested in using.

Solution

• start.sh should ask which services to start and save them in the env file
• Other supporting files like docker-compose.yaml may need to be updated to support docker profiles, etc. See social-app-template start.sh for more details on how it might be implemented.