Robert Cecil Martin:

the database is a detail

the framework is a detail

There are three layers.

1. Buisness logic (entities and use cases)
2. Storage. Now we just use a variable, but we can easy change to something else. For example, postgresql or third party api. Because buisness logic don't depend from Storage.
3. API. It is our external layer. Now it is Gin. Similarly we can use other web framework. Not even necessarily a web.

All in docker-compose 😄 that's why easy to run and to use.

In this case we have union Clear Architecture and https://github.com/golang-standards/project-layout