Local PostgreSQL container for query analysis / validation

[nikolayk812]

Add a testcontainers_image field to the database config block. When set, sqlc automatically starts a local PostgreSQL Docker container, applies schema migrations, and uses it for analysis — then tears it down when done.

database:
      testcontainers_image: "postgres:18-alpine"

#4513

[davideimola]

I really like the idea of using containers in development!

[ayakovlenko]

Does it have to be called testcontainers_image? Why not just image or container_image to not leak implementation details about the library used to the public API?

[kyleconroy]

@nikolayk812 sorry, I'm not interested in adding Docker / container support at this time.

[nikolayk812]

@kyleconroy fair enough. I got a feeling that in-memory mode of sqlc should be deprecated or discouraged. In-memory supports results in reimplementing lots of semantical validations in the generator, which DB can do automatically.

But then current DB mode is limited, in a way that it requires migrations to be applied separately, outside of the generator if I understand correctly. Is this to give advantage to SQLc Cloud?