Starting docker-compose test containers as non-root user

Similar to: https://github.com/testcontainers/testcontainers-java/issues/2590

I'm trying to start our docker-compose based testcontainers tests, and pass in the local username from the running system, in order that the container can write files to mounted volumes with the correct permissions.

I tried a compose with:

version: "3.7"
services:
  myservice:
    image: xxx
    user: ${CURRENT_USER}
    ...
    volumes:
      ./target/:/target

And passed in CURRENT_USER environment variable to testcontainers using:

  env = new DockerComposeContainer(new File("src/main/docker/docker-compose.yml"));
  env.withLocalCompose(true);
  env.withEnv("CURRENT_USER", System.getProperty("user.name"));

However, this fails with:

Cannot start service my server: unable to find user bmiddleton: no matching entries in passwd file

I presume it's looking for that user in the ryuk container, and not the OS - where the user does exist.

How can I get a testcontainers test running from a docker compose file to write its files using the current user of the operating system?

Start with the DockerComposeContainer setup using src/main/docker/docker-compose.yml, including withLocalCompose(true) and withEnv("CURRENT_USER", System.getProperty("user.name")). Reproduce the compose-based test failure and inspect how the compose service user and mounted ./target/ volume are handled. Done means the service can write mounted files with the current OS user's permissions without the passwd lookup error.