add forgoten STOPSIGNAL to uptimekuma

apps/uptimekuma/Dockerfile

@@ -50,6 +50,8 @@ USER        container
 ENV         USER=container HOME=/home/container
 WORKDIR     /home/container
 
+STOPSIGNAL SIGINT
+
 COPY        --chown=container:container ./entrypoint.sh /entrypoint.sh
 RUN         chmod +x /entrypoint.sh
 ENTRYPOINT    ["/sbin/tini", "-g", "--"]