Adds basic healthcheck to Dockerfile

Change-Id: Ia69f49dbfb6e1ff479548d19327d5f26e1a291ed
Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 60dbeae..a3cb316 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -47,4 +47,7 @@
 
 ENV OSMPOL_GLOBAL_LOGLEVEL INFO
 
+HEALTHCHECK --interval=5s --timeout=2s --retries=12 \
+  CMD osm-pol-healthcheck || exit 1
+
 CMD /bin/bash /policy_module/docker/scripts/start.sh
\ No newline at end of file