Add sample file to cores folder to test upload artifacts

Signed-off-by: Dmitrii Petukhov <[email protected]>

bmq-sdk/src/test/docker/Dockerfile

@@ -17,6 +17,8 @@ RUN echo "kill -QUIT $BROKER_PID" >> /tmp/startup.sh
 RUN echo "sleep 5" >> /tmp/startup.sh
 RUN echo "cat /proc/sys/kernel/core_pattern" >> /tmp/startup.sh
 RUN echo "ls -lah /tmp/cores" >> /tmp/startup.sh
+RUN echo "cat /proc/sys/kernel/core_pattern > /tmp/cores/sample.txt" >> /tmp/startup.sh
+RUN echo "ls -lah /tmp/cores" >> /tmp/startup.sh
 RUN chmod +x /tmp/startup.sh
 CMD ["/tmp/startup.sh"]