As an alternative to the postgres and redis datastores, there is also a mongodb resource provisioner as an example
of a document database. This uses the official image from https://hub.docker.com/_/mongo.
resources:
db:
type: mongodb
The provided outputs are host, port, username, password, connection. The latter is equal to a mongodb
connection string like mongodb://${resources.db.username}:${resources.db.password}@${resources.db.host}:${resources.db.port}/}.