License header check needs to account for shebangs other than #!/bin/bash

[jakepetroules]

This is overly restrictive:

github-workflows/.github/workflows/scripts/check-license-header.sh

Line 98 in 3b5576d

sh) comment_marker='##'; header_prefix=$'#!/bin/bash\n' ;;

On some platforms, bash is not located at /bin/bash. For example, on FreeBSD it's at /usr/local/bin/bash, making #!/usr/bin/env bash necessary for maximum portability.