A demo accessing a (local) MongoDB and Postgres instance.
Mongo Quickstart: https://www.mongodb.com/blog/post/quick-start-golang-mongodb-starting-and-setup
GORM: https://gorm.io/docs/
$ docker run -it --name mongo -p 27017:27017 -d mongo
$ docker run -it --name postgres -p 5432:5432 -e POSTGRES_PASSWORD=password -d postgres