Create unit files to auto restart services after minion update

Reference: https://progress.opensuse.org/issues/158814

Makefile

@@ -104,6 +104,7 @@ install-generic:
 	install -d -m 755 "$(DESTDIR)"/usr/lib/systemd/system
 	install -d -m 755 "$(DESTDIR)"/usr/lib/systemd/system-generators
 	install -d -m 755 "$(DESTDIR)"/usr/lib/tmpfiles.d
+	eval "$$(perl -V:installvendorlib)" && sed -i -e "s^installvendorlib^$$installvendorlib^" systemd/openqa-minion-restart.path
 	for i in systemd/*.{service,slice,target,timer,path}; do \
 		install -m 644 $$i "$(DESTDIR)"/usr/lib/systemd/system ;\
 	done

dist/rpm/openQA.spec

@@ -664,6 +664,8 @@ fi
 %{_localstatedir}/lib/openqa/script
 %{_localstatedir}/lib/openqa/tests
 %{_datadir}/openqa/script/openqa-check-devel-repo
+%{_unitdir}/openqa-minion-restart.service
+%{_unitdir}/openqa-minion-restart.path
 
 %files worker
 %{_datadir}/openqa/lib/OpenQA/CacheService/

systemd/openqa-minion-restart.path

@@ -0,0 +1,5 @@
+[Path]
+PathChanged=installvendorlib/Minion/Backend/resources/migrations/pg.sql
+
+[Install]
+WantedBy=multi-user.target

systemd/openqa-minion-restart.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Restarts services which are using Minion
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/systemctl try-restart openqa-webui.service openqa-gru.service openqa-worker-cacheservice.service openqa-worker-cacheservice-minion.service