Fix: Add handled stopsignal to Dockerfile (#1159)

At the moment the application only handles the SIGINT signal.

Co-authored-by: Denny Pradipta <denny@hyperjump.tech>
Co-authored-by: Nico Prananta <nicnocquee@users.noreply.github.com>

Dockerfile

@@ -23,4 +23,5 @@ RUN npm install -g --unsafe-perm ./hyperjumptech-monika-*.tgz
 WORKDIR /
 RUN mkdir /config
 
+STOPSIGNAL SIGINT
 CMD ["monika"]