message: Tags envoy docker image with the Travis build commit
diff: @@ -19,6 +19,7 @@ then
  then
  docker login -e $DOCKER_EMAIL -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
  docker push lyft/envoy:latest
  + test -z "$TRAVIS_COMMIT" || docker push lyft/envoy:$TRAVIS_COMMIT
  else
  echo 'Ignoring PR branch for docker push.'
  fi
  