Shell executor doesn't clean up build directories
I have noticed that our Windows builders have started to fill their disks after only a day or two of building. Almost all of the space used is in
\GitLabRunner\builds. It appears that the
shell executor (which as far as I can tell is the only supported executor on Windows until #2609 (closed) or !706 (closed) is resolved) is not cleaning up build directories after they have finished.
The behavior is the same for the shell executor on all platforms.