utils/filtron.sh: add script to install filtron middleware

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/templates/lib/systemd/system/filtron.service

@@ -0,0 +1,29 @@
+[Unit]
+
+Description=${SERVICE_NAME}
+After=syslog.target
+After=network.target
+
+[Service]
+
+Type=simple
+User=${SERVICE_USER}
+Group=${SERVICE_GROUP}
+WorkingDirectory=${SERVICE_HOME}
+ExecStart=${SERVICE_HOME}/go-apps/bin/filtron -rules ${FILTRON_RULES}
+
+Restart=always
+Environment=USER=${SERVICE_USER} HOME=${SERVICE_HOME}
+
+# Some distributions may not support these hardening directives.  If you cannot
+# start the service due to an unknown option, comment out the ones not supported
+# by your version of systemd.
+
+ProtectSystem=full
+PrivateDevices=yes
+PrivateTmp=yes
+NoNewPrivileges=true
+
+[Install]
+
+WantedBy=multi-user.target