Update bash shebangs to use "/usr/bin/env bash" for increased portability Upstream-commit: 572002a71593009bd4dd3285ac429b70042b6ce6 Component: engine
The `contrib` directory contains scripts, images, and other helpful things which are not part of the core docker distribution. Please note that they could be out of date, since they do not receive the same attention as the rest of the repository.