Support `include`

[oxisto]

It would be nice to support the include pattern to include other docker-compose files (see https://docs.docker.com/compose/how-tos/multiple-compose-files/include/). We use this quite extensively in dev-containers.

I already starting working on this, just need a while to get familiar with the project.

[Mcrich23]

I am very excited for this! Thank you.

[oxisto]

I am very excited for this! Thank you.

yeah its one of the features I am personally missing. Unfortunately I was a little busy at work but I will pick up the task over the next days hopefully again.