Deploy an existing Docker image to Heroku

deploy.sh

#!/bin/bash
# Requires docker CLI and heroku CLI

# Specify here the docker image you want to deploy from Docker registry
docker_image=damoeb/rss-proxy
# Specify here the name of your Heroku app
heroku_app=my-heroku-app

docker pull $docker_image
id=`docker images | grep $docker_image | awk '{print $3}'`
docker tag $id registry.heroku.com/$heroku_app/web
docker push registry.heroku.com/$heroku_app/web
heroku container:release web --app=$heroku_app