fix error running under Alpine

env: can't execute 'bash': No such file or directory

use sh as lowest common denominator

Author: defeated

lib/install/dev

@@ -1,8 +1,8 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 if ! gem list foreman -i --silent; then
   echo "Installing foreman..."
   gem install foreman
 fi
 
-foreman start -f Procfile.dev "$@"
+exec foreman start -f Procfile.dev "$@"