Question: Can I cache a docker image

What are you trying to do?

I have a docker image which is based on postgres, but contains
additional some (large) *.sql files in /docker-entrypoint-initdb.d/ .

When the docker container is started, it will import the sql files.
This will delay the startup time until I can access the docker image for testing.

I assume that when I use testcontainers it is similiar to the call

docker run --rm

in the sense, that after the container was used, it is thrown away.

Is it possible to tell testcontainers to cache the container, so the next time I use that image the
database is already initialized?

首先检查 Testcontainers 的容器生命周期，以及 docker run --rm 所体现的 Docker 行为，尤其是从 /docker-entrypoint-initdb.d/ 进行 PostgreSQL 初始化的行为。确定是否支持复用或缓存，然后记录受支持的行为，或记录使已初始化容器可缓存所需的范围。