Temporarily bypass postinst adduser error, part 2

debian/dovecot-keylookupd.postinst

@@ -4,7 +4,8 @@ set -e
 
 case "$1" in
 configure)
-    addgroup --system --quiet dovecot-keylookupd
+    addgroup --system --quiet dovecot-keylookupd \
+      || true
     adduser --system --no-create-home --home /run/dovecot-keylookupd \
       --disabled-password --disabled-login \
       --quiet --ingroup dovecot-keylookupd dovecot-keylookupd \