Error when connecting to docker-rootless socket via tcp

[vf-jes]

When running testcontainers in GitLab CI with dind-rootless service, it does not work when connecting via tcp.

It works with dind (rootful):

.gitlab-ci.yml:

test:
  stage: test
  image: php:8.3-cli
  services:
    - docker:29-dind
  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_TLS_CERTDIR: ""

Doesn't work with dind-rootless (Exact same setup works with testcontainers-dotnet)

.gitlab-ci.yml:

test:
  stage: test
  image: php:8.3-cli
  services:
    - docker:29-dind-rootless
  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_TLS_CERTDIR: ""
    TESTCONTAINERS_RYUK_DISABLED: true

This is the error:
1) Exception in third-party event subscriber: Cannot read the response
#0 /builds/group/project/vendor/php-http/socket-client/src/Client.php(85): Http\Client\Socket\Client->readResponse()
#1 /builds/group/project/vendor/php-http/client-common/src/HttpClientDecorator.php(28): Http\Client\Socket\Client->sendRequest()

It works when binding the dind docker socket though:

.gitlab-ci.yml:

test-php:
  stage: test
  image: php:8.3-cli
  services:
    - name: docker:29-dind-rootless
  variables:
    DOCKER_HOST: "unix:///runner/services/docker/docker.sock"
    TESTCONTAINERS_RYUK_DISABLED: true
    TESTCONTAINERS_HOST_OVERRIDE: docker

In /etc/gitlab-runner/config.toml
volumes = ["/runner/services/docker", "/cache"]