fix(s6-overlay): shutdown of service when run as root

Author: reubenmiller

packaging/services/s6-overlay/tedge-container-plugin/finish

@@ -0,0 +1,7 @@
+#!/command/with-contenv sh
+PROC_PID=$(pgrep -f "/usr/bin/tedge-container run" ||:)
+if [ -n "$PROC_PID" ]; then
+    echo "sending SIGTERM to pid=$PROC_PID"
+    sudo kill -15 "$PROC_PID" || echo "Failed to stop tedge-container service"
+fi
+exit 0