If rsync fails in deploy setup, raise an error

Currently, rsync from demo.gramener.com has a || true at the end of the line.

This is to prevent errors in case demo.gramener.com:/deploy/<dir> does not exist.

But if the rsync fails for other reasons (e.g. SSH key failure), this SHOULD raise an error.

So if the exit code returned by rsync (in $? is 23), don't raise an error. Otherwise, raise an error reference