Failed to start the container in AWS code build

[nicofari]

Hello

I have a kotlin project which uses atmoz/sftp via testcontainers (genericcontainer actually) to run a couple of tests.
These run fine locally.
On AWS code build though I get this error:

15:21:54.885 DEBUG org.testcontainers.shaded.com.github.dockerjava.core.exec.InspectContainerCmdExec - GET: DefaultWebTarget{path=[/containers/243c4037269bfcd0cbcdab0351b72118eaa7bbc80fc1b3e020a1e510d29922b5/json], queryParams={}}

1156 | 15:21:54.935 DEBUG org.testcontainers.shaded.com.github.dockerjava.core.command.AbstrDockerCmd - Cmd: 243c4037269bfcd0cbcdab0351b72118eaa7bbc80fc1b3e020a1e510d29922b5,false
1157 | 15:21:54.935 DEBUG org.testcontainers.shaded.com.github.dockerjava.core.exec.InspectContainerCmdExec - GET: DefaultWebTarget{path=[/containers/243c4037269bfcd0cbcdab0351b72118eaa7bbc80fc1b3e020a1e510d29922b5/json], queryParams={}}
1158 | 15:21:54.995 ERROR tc.atmoz/sftp:latest - Could not start container

Below the cause seems this (not sure at all):

15:21:55.051 ERROR tc.atmoz/sftp:latest - Log output from the failed container:

1255 | exec /entrypoint: exec format error

After lot of attempts I create the container this way:

    GenericContainer("atmoz/sftp:latest")
        .withCopyFileToContainer(
            MountableFile.forHostPath("$remoteFolderPath/", 511),
            "/home/foo"
        )
        .withCreateContainerCmdModifier { cmd -> cmd.withPlatform("linux/amd64") }
        .withExposedPorts(hostPort)
        .withCommand("$username:$password").use { sftpServer ->

I've added the line with "withPlatform" trying to fix but it does not work
I've tried with linux/arm64 too but same results.

Any idea?

tia