Add an "iprep-tail" systemd unit to the Debian package

debian/iprep-tail.default

+IPREP_PATTERNS=/etc/iprep/patterns
+IPREP_SERVER=

debian/iprep-tail.service

+[Unit]
+Description=Tailer for iprep
+After=nginx.service
+
+[Service]
+EnvironmentFile=-/etc/default/iprep-tail
+ExecStart=journalctl --output=cat | iprep tail --patterns=$IPREP_PATTERNS --server=$IPREP_SERVER
+
+NoNewPrivileges=yes
+ProtectSystem=full
+ReadOnlyDirectories=/
+
+[Install]
+WantedBy=multi-user.target

debian/iprep.install

+example.patterns etc/iprep/patterns

debian/rules

@@ -8,3 +8,8 @@ export DH_GOLANG_EXCLUDES = vendor
 override_dh_auto_install:
 	dh_auto_install -- --no-source
 
+override_dh_systemd_enable:
+	dh_systemd_enable --no-enable --name=iprep-tail
+
+override_dh_systemd_start:
+	dh_systemd_start --no-start --name=iprep-tail