I'd be really surprised if most applications that rely on databases can't just use a containerized image of their production database in any environment, includ

I'd be really surprised if most applications that rely on databases can't just use a containerized image of their production database in any environment, including CI. In fact, the only example I can really think of is when the production database can't be Dockerized (e.g. a proprietary SaaS database like BigQuery or Snowflake). I'm working on a project that has ~22,000 tests that operate on Docker container of the same version of Postgres used in production. In CI it completes all the database tests in under a minute.