Verbose docker build

The container build process feels a bit not that transparent, I feel. But using: docker-compose build --progress=plain it becomes a bit more transparent.

When running the above, I saw more info about the command, that was run, even if it is just that it is using a cached result.

#10 [ 3/13] RUN apt-get update && apt-get install -y build-essential
#10 CACHED

#11 [ 8/13] RUN df -ha
#11 CACHED