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?

Comienza revisando el ciclo de vida de los contenedores de Testcontainers y el comportamiento de Docker implícito en docker run --rm, especialmente la inicialización de PostgreSQL desde /docker-entrypoint-initdb.d/. Determina si se admite la reutilización o el almacenamiento en caché y, a continuación, documenta el comportamiento admitido o el alcance necesario para un contenedor inicializado que pueda almacenarse en caché.