print the commit that the interop docker image was build with

interop/run_endpoint.sh

@@ -4,6 +4,8 @@ set -e
 # Set up the routing needed for the simulation.
 /setup.sh
 
+echo "Using commit:" `cat commit.txt`
+
 if [ "$ROLE" == "client" ]; then
     # Wait for the simulator to start up.
     /wait-for-it.sh sim:57832 -s -t 10