Add smoke/health tests to OSM stage_3

Change-Id: I11b5aab4d4fcd496e47ff8d483ebd4ad771cd780
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
diff --git a/docker/NBI/Dockerfile b/docker/NBI/Dockerfile
index 08f4ee5..0531f3a 100644
--- a/docker/NBI/Dockerfile
+++ b/docker/NBI/Dockerfile
@@ -66,5 +66,8 @@
 ENV OSMNBI_LOG_FILE        /app/log/nbi.log
 ENV OSMNBI_LOG_LEVEL       DEBUG
 
+HEALTHCHECK --interval=5s --timeout=2s --retries=12 \
+  CMD curl -k https://localhost:9999/osm/ | grep Welcome || exit 1
+
 # Run app.py when the container launches
 CMD ["python3", "/usr/lib/python3/dist-packages/osm_nbi/nbi.py"]