Change shebang to use env for bash, fixes #27

[shelane]

The Issue

• Change shebang to ensure proper bash is used #27

How This PR Solves The Issue

Changes the shebang line to use the env program to determine the user's path to bash.

Manual Testing Instructions

ddev add-on get https://github.com/<user>/<repo>/tarball/<branch>
ddev restart

Automated Testing Overview

No changes to existing tests as this would work with existing test.

Release/Deployment Notes

No expected ramifications to other code

[rfay]

Thanks!

I thought we had this fixed in so very many places.

How did you encounter this? On a system without /bin/bash?

[shelane]

I watched an informative YouTube video on the importance of the shebang for bash scripts. Then I searched my ddev projects to make sure all of my commands were using the right setting. The phpmyadmin addon was the only one I found that had the /bin/bash set.