docker build -t gcr.io/hightowerlabs/github-webhook:v1 .

gcloud docker -- push gcr.io/hightowerlabs/github-webhook:v1

docker tag gcr.io/hightowerlabs/github-webhook:v1 \
  registry.heroku.com/github-webhook-heroku/web

docker push registry.heroku.com/github-webhook-heroku/web