Change script-runner/stack-test shebang to #!/bin/bash
Change script-runner/stack-test shebang to #!/bin/bash

pushd and popd are bash built-ins and, on some operating systems, the default shell implementation (/bin/sh) does not support them.
For example, on Debian, the default /bin/sh is a symlink to dash which doesn't support popd and pushd.

input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl