testcontainers / testcontainers-scala

I've made a lot of attempts..

I have two runners:

concurrent = 1
check_interval = 0
shutdown_timeout = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "Docker in docker"
  url = "******"
  id = 26
  token = "your_token"
  token_obtained_at = 2023-05-29T13:04:02Z
  token_expires_at = 0001-01-01T00:00:00Z
  executor = "docker"
  [runners.cache]
    MaxUploadedArchiveSize = 0
  [runners.docker]
    tls_verify = false
    image = "docker:19.03-dind"
    privileged = true
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    pull_policy = "if-not-present"
    volumes = ["/certs/client", "/cache"]
    shm_size = 0
    environment = [
        "DOCKER_HOST=tcp://localhost:2375",
    ]

[[runners]]
  name = "MACHINE_NAME"
  url = "******"
  token = "GENERATED_GITLAB_RUNNER_TOKEN"
  executor = "docker"
  [runners.docker]
    tls_verify = false
    image = "docker:latest"
    privileged = false
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/var/run/docker.sock:/var/run/docker.sock", "/cache"]
    shm_size = 0

And I have a test that runs compose:

  override def startContainers(): Containers = {
    val dockerComposeContainer = DockerComposeContainer(
        DockerComposeContainer.ComposeFile(Left(new File("src/test/resources/docker/docker-compose.yml"))),
        exposedServices = Seq(
*********
        )
      )
    dockerComposeContainer.start()
    dockerComposeContainer
  }

Locally - everything works for me, but something is constantly wrong in CI.
I have tried several ci configurations:

test:
  stage: test
  tags:
    - dind
  variables:
    # Instruct Testcontainers to use the daemon of DinD, use port 2375 for non-tls connections.
    DOCKER_HOST: "tcp://docker:2375"
    # Instruct Docker not to start over TLS.
    DOCKER_TLS_CERTDIR: ""
    # Improve performance with overlayfs.
    DOCKER_DRIVER: overlay2
  image: ******/artifacts/build-tools/scala-sbt-docker-image:latest
  services:
    - name: docker:dind
      # explicitly disable tls to avoid docker startup interruption
      command: ["--tls=false"]
  cache:
    paths:
      - target/
  script:
    - sbt clean coverage test coverageReport
    - mkdir -p public
    - mkdir -p public/coverage
    - cp -rv target/${SCALA}/scoverage-report public/coverage
  artifacts:
    expire_in: 1 days
    name: coveragereport
    paths:
      - public/coverage

and this(with second runner):

test:
  stage: test
  tags:
    - test
  image: ******/artifacts/build-tools/scala-sbt-docker-image:latest
  cache:
    paths:
      - target/
  script:
    - sbt clean coverage test coverageReport
    - mkdir -p public
    - mkdir -p public/coverage
    - cp -rv target/${SCALA}/scoverage-report public/coverage
  artifacts:
    expire_in: 1 days
    name: coveragereport
    paths:
      - public/coverage

The most common mistakes:

the application cannot connect to the service from compose by port
can't wait for the service to start (waits for the port to be listened to)

Run DockerComposeContainer on GitLab CI