Bug 40901: (follow-up) Preserve 'service koha-common' UX with systemd

Adds PartOf=koha.target to koha@.target so that stopping or
restarting the global target propagates to all instance targets
and their services.

Ships a koha-common.service oneshot unit that delegates to
koha.target, so 'systemctl restart koha-common' works as the
drop-in replacement for the old 'service koha-common restart'.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@openfifth.co.uk>
Signed-off-by: Pedro Amorim <pedro.amorim@openfifth.co.uk>

debian/systemd/koha-common.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Koha ILS - All instances (compat)
+Documentation=man:koha-common(8)
+BindsTo=koha.target
+After=koha.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/systemctl start koha.target
+ExecStop=/bin/systemctl stop koha.target
+
+[Install]
+WantedBy=multi-user.target

debian/systemd/koha@.target

@@ -1,6 +1,7 @@
 [Unit]
 Description=Koha ILS instance %i
 After=network.target memcached.service mysql.service
+PartOf=koha.target
 StopWhenUnneeded=yes
 
 [Install]