Use /bin/bash as dak's shell

Signed-off-by: NMark Hymers <mhy@debian.org>

setup/README

@@ -17,7 +17,7 @@ For the purposes of this document, we'll be working in /srv/dak
 
 Set up the dak user on both the system and in postgres:
 # sudo addgroup --system ftpmaster
-# sudo adduser --system dak --ingroup ftpmaster
+# sudo adduser --system dak --ingroup ftpmaster --shell /bin/bash
 # sudo -u postgres createuser -s dak
 
 Set up the dak directory: