Correcting Dockerfile

Missing COPY of main binary restored

Change-Id: I823f001ce5a062962d91315c3c95d4e6159a0d4f
Signed-off-by: Balint Uveges <balint.uveges@nokia.com>
diff --git a/Dockerfile b/Dockerfile
index 4676ec2..942ccc2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -86,6 +86,7 @@
 RUN apt update && apt install -y iputils-ping net-tools curl tcpdump
 
 COPY run_submgr.sh /
+COPY --from=submgrbuild /opt/bin/submgr /
 COPY --from=submgrbuild /usr/local/include /usr/local/include
 COPY --from=submgrbuild /usr/local/lib /usr/local/lib
 RUN ldconfig