[cshokie]

Not the OP, but I don’t think they meant that the build output is in a container. They meant that the thing you use to compile the code is in docker (and you just copy out the result). That would help ensure consistency of builds without having any effect on downstream users.

[eschneider]

Exactly. The compiler and what ever dependencies you need _to build_ are bundled into a docker so that you don't need to worry about whatever random tools/libraries your coworkers have installed in their local environment.