This should make all bash-scripts run on pretty much any posix-system (with bash installed ofc...)

Docker-DCO-1.1-Signed-off-by: Kim BKC Carlbacker <kim.carlbacker@gmail.com> (github: bkcsoft)
Merge pull request #3707 from bkcsoft/fix-bash-hashbangs

Update bash shebangs to use "/usr/bin/env bash" for increased portability