Bug 40901: (QA follow-up) Restore the RabbitMQ and memcached steps in koha-common.postinst

The monolithic koha-common.postinst ended by enabling the rabbitmq_stomp
plugin, restarting RabbitMQ and restarting memcached (Bug 35242). None
of that survived the split: koha-core.postinst never had it and the new
koha-common.postinst was an empty stub. A fresh "apt install koha-common"
therefore left the STOMP plugin disabled, and upgrades stopped flushing
memcached, which is exactly the stale-cache class of bug 35242 fixed.

koha-common is the package that depends on rabbitmq-server and
memcached, so the steps belong in its postinst. The copy in
koha-full.postinst is dropped now that koha-full depends on
koha-common.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Signed-off-by: Martin Renvoize <martin.renvoize@openfifth.co.uk>
Signed-off-by: Pedro Amorim <pedro.amorim@openfifth.co.uk>

debian/koha-common.postinst

@@ -4,4 +4,19 @@ set -e
 
 #DEBHELPER#
 
+if [ "$1" = "configure" ]; then
+    # koha-common is the package that pulls in RabbitMQ and memcached, so
+    # it keeps the service-level steps the monolithic package used to run.
+
+    # Koha's background jobs reach RabbitMQ over STOMP: make sure the plugin
+    # is enabled and the broker has picked it up.
+    if command -v rabbitmq-plugins >/dev/null 2>&1; then
+        rabbitmq-plugins enable rabbitmq_stomp
+        service rabbitmq-server restart || true
+    fi
+
+    # Bug 35242: Force memcache restart after koha install/upgrade
+    service memcached restart || true
+fi
+
 exit 0

debian/koha-full.postinst

@@ -5,7 +5,4 @@ set -e
 a2enmod mpm_itk rewrite cgi rewrite headers proxy_http
 service apache2 restart
 
-rabbitmq-plugins enable rabbitmq_stomp
-service rabbitmq-server restart
-
 exit 0