Make it possible to start only particular services when start the devcontainer

[dzhlobo]

Sometimes we would want to start only one particular service (frontend or api) while we work on it individually. I want to play with it and provide decent examples.

[ezhlobo]

Maybe it makes sense not to control what services to run but rather start devcontainer without any just to hav correct environment. Then we'll be able to do docker-compose up or any specific service right from inside devcontainer.