Explain `stack deploy` with multiple Compose files
Explain `stack deploy` with multiple Compose files

The Docker Compose docs suggest using a separate override
configuration file for production-specific settings, but
it is not obvious how to feed this to `docker stack deploy`,
which only supports a single Compose file as input. Thus,
we now describe how to do this by merging the configuration
files with `docker-compose config`.

Signed-off-by: Denis Washington <e7d361c7f6c045f0c4fa54d2afc4a237f30bc767@denisw.de>
Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

ashfall/cli,allencloud/cli,ashfall/cli,redpanda/cli,cpuguy83/cli,thaJeztah/cli,docker/cli,dnephin/cli,Zebrilee/cli,cpuguy83/cli,riyazdf/cli,allencloud/cli,docker/cli,redpanda/cli,dnephin/cli,thaJeztah/cli,Zebrilee/cli,riyazdf/cli