Revert "ref(controller): use /bin/sh for better portability"

This reverts commit a897ddb2aba0dbc2068599a9263a21077f13679c.
Revert "ref(tests): switch to example-dockerfile-http app"

This reverts commit d4b9ca897f5535733cd89daac08ec61baf0d1f20.
Merge pull request #2664 from bacongobbler/revert-to-bash

revert to /bin/bash for run commands