Bug: Keycloak container fails with 'HTTPS required'

Describe the bug

The basic example from Keycloak does not run.

There is actually another "solvable" bug that the library python-keycloak does not work on version 5.7.1 due to a missing import (KeycloakClient), and must be downgraded to 5.6.0

To Reproduce

I have used the exact example provided in the source code here:

from testcontainers.keycloak import KeycloakContainer

def test_keycloak_setup():
    with KeycloakContainer(f"quay.io/keycloak/keycloak:25.0.4") as keycloak:
        counts = keycloak.get_client().users_count()
        print(counts)

I have also tried the example on the repo example_basic.py, and this one also does not run, but fails early since the API for the library has changed.

I understand that keycloak is sometimes a pain to setup with insecure options, and probably it needs extra options, but it's unclear from the docs that that is the case. Docs here:

https://testcontainers-python.readthedocs.io/en/latest/modules/keycloak/README.html

I could offer my help to tackle the issue for a working solution, the question is if the change is for documentation (keycloak is not expected to work out of the box) or configuration. It's also possible that it needs a realm import.

Runtime environment

# Get the operating system information (on a unix os).
$ uname -a
Darwin
# Get the python version.
$ python --version
3.10.11
# Get the docker version and other docker information.
$ docker info
Client:
 Version:    28.3.2
 Context:    desktop-linux
 Debug Mode: false
# Get all python packages.
$ pip freeze
testcontainers==4.12.0
python-keycloak==5.6.0

Bắt đầu với modules/keycloak/testcontainers/keycloak/init.py và modules/keycloak/example_basic.py, sau đó tái hiện lỗi bằng Keycloak 25.0.4 và python-keycloak 5.6.0. Kiểm tra README của Keycloak được liên kết trong issue và xác định xem thiết lập hoạt động có yêu cầu thay đổi về cấu hình hoặc tài liệu hay không; hoàn tất khi ví dụ cơ bản chạy thành công và thiết lập cần thiết đã rõ ràng.