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Run pgAdmin 4 in a container on Heroku by using the DATABASE_URL from the config:
# get database url from an existing app
export DATABASE_URL=`heroku config:get DATABASE_URL -a hasura-heroku`
export PGADMIN_DEFAULT_EMAIL=admin
export PGADMIN_DEFAULT_PASSWORD=`python3 -c 'import secrets; print(secrets.token_urlsafe(16))'`
heroku create example-pgadmin --region eu
heroku stack:set container -a example-pgadmin
heroku config:set DATABASE_URL=$DATABASE_URL
heroku config:set PGADMIN_DEFAULT_EMAIL=$PGADMIN_DEFAULT_EMAIL
heroku config:set PGADMIN_DEFAULT_PASSWORD=$PGADMIN_DEFAULT_PASSWORD
git push heroku master
echo "Login: $PGADMIN_DEFAULT_EMAIL / $PGADMIN_DEFAULT_PASSWORD"Docker
docker build . -t pgadmin
docker run -e PORT=4444 -e DATABASE_URL=$DATABASE_URL -p 4444:4444 pgadmin