> If you are using Go (which solves most of your dependency problems) and SQLite (which means you don't need to integrate with an external database via service discovery) why do you need Docker at all?

Dependencies is not really a problem with Docker, nor the thing it is designed to solve. If dependencies was the problem people cared about, everyone would just go with the single statically linked executable/fat JAR and no one would ever be bothered with Docker.

Docker is primarily about containerization, but it's also about ease of packaging and deployment. It's also a deployment format that provides horizontal scaling for free.

Also, the one-database-per-service architecture pattern is quite common, as well as ephemeral databases and local caching, and keep in mind that SQLite also supports in-memory databases.