Provide generic DockerContainer with init attributes

First I want to thank you for this very nice and convenient library.

Background

I am using the library for smoke tests for microservices. In these tests I spin up a container and make sure I can e.g., fetch an endpoint and see that the container is built and starts correctly.

The library provides all convenient methods, except for a way to set e.g., ports and env variables in the context manager. To solve this I have subclassed testcontainers.core.container.DockerContainer into a class as below:

from typing import Any

import testcontainers.core.container

class ContainerContext(testcontainers.core.container.DockerContainer):
    def __init__(
        self, image: str, ports: list[int], env_vars: dict[str, str], **kwargs: Any
    ) -> None:
        super().__init__(image, **kwargs)

        self.with_exposed_ports(*ports)
        for env, value in env_vars.items():
            self.with_env(env, value)

and use it as

import requests

def test_smoke():
    with container_context(
        "my_service_image",
        ports=[8000],
        env_vars={"SOME_ENV_SETTINGS": "some_value", "SOME_ENV_SETTINGS2": "other_value"},
    ) as con:
        r = requests.get(
            f"http://{con.get_container_host_ip()}:{con.get_exposed_port(8000)}"
        )
        assert r

Proposal

• Include a generic container class where all name, ports, env, volumes, … can be set as init variables.

I saw #114 that removed the previous GenericContainer but I don't see a motivation why it was done and why it could not be extended.

Xem xét testcontainers.core.container.DockerContainer và việc loại bỏ GenericContainer trước đây được thảo luận trong #114. So sánh các thuộc tính khởi tạo được yêu cầu —name, ports, env và volumes— với API container hiện có, và coi đề xuất là hoàn tất khi một container generic có thể cấu hình các giá trị này lúc khởi tạo mà không cần subclass.