Backport creation of /dev/shm in the sandbox to bst-1
Backport of !1694 (merged)
I'd like to use the bazel_build plugin in 1.4.x too, but unfortunately it requires this change. If this is deemed unsuitable to backport, I can handle it in the plugin. However doing so means we will mount in the host /dev/shm, which is a bit sad.
Edited by Javier Jardón