[Bug]: TESTCONTAINERS_CHECKS_DISABLE doesn't stop alpine image from being pulled

Module

Core

Testcontainers version

1.21.3

Using the latest Testcontainers version?

Yes

Host OS

Ubuntu

Host Arch

x86

Docker version

Docker version 20.10.15, build fd82621

What happened?

When setting TESTCONTAINERS_CHECKS_DISABLE, the Alpine image is still being pulled. It is therefore necessary to set TESTCONTAINERS_TINYIMAGE_CONTAINER_IMAGE to something that my CI (Jenkins) can access, in order to pull that image. The docs state that if TESTCONTAINERS_CHECKS_DISABLE is true, this shouldn't happen

Relevant log output

09:33:21  2025-11-24T09:33:21.309+0000 [DEBUG] [TestEventLogger]     {"timestamp":"2025-11-24T09:33:20.633Z","severity":"INFO","message":"Testcontainers version: 1.21.3","process":{"thread":{"name":"Test worker"}}}
09:33:24  2025-11-24T09:33:23.561+0000 [DEBUG] [TestEventLogger]     {"timestamp":"2025-11-24T09:33:23.561Z","severity":"INFO","message":"Found Docker environment with local Unix socket (unix:///var/run/docker.sock)","process":{"thread":{"name":"Test worker"}}}
09:33:24  2025-11-24T09:33:23.736+0000 [DEBUG] [TestEventLogger]     {"timestamp":"2025-11-24T09:33:23.736Z","severity":"WARN","message":"\n********************************************************************************\nRyuk has been disabled. This can cause unexpected behavior in your environment.\n********************************************************************************","process":{"thread":{"name":"Test worker"}}}
09:33:24  2025-11-24T09:33:23.848+0000 [DEBUG] [TestEventLogger]     {"timestamp":"2025-11-24T09:33:23.848Z","severity":"INFO","message":"Pulling docker image: alpine:3.17. Please be patient; this may take some time but only needs to be done once.","process":{"thread":{"name":"Test worker"}}}
09:33:25  2025-11-24T09:33:24.983+0000 [DEBUG] [TestEventLogger]     {"timestamp":"2025-11-24T09:33:24.972Z","severity":"ERROR","message":"Error during callback","process":{"thread":{"name":"docker-java-stream-1039059310"}},"error":

Additional Information

No response

Comienza rastreando cómo se gestiona TESTCONTAINERS_CHECKS_DISABLE durante la inicialización de Core y dónde se activa la descarga de la imagen alpine:3.17. Verifica el comportamiento documentado de los checks deshabilitados comparándolo con el log reportado, y añade o actualiza la cobertura para que la imagen de Alpine no se descargue cuando la configuración esté habilitada.