feat(core): DockerCompose.stop now stops only services that it starts (does not stop the other services)

[aksel]

The command would otherwise stop/down all services, not just the services the instance itself started.

Useful for e.g. one fixture per service, and you want different scopes for the services.

[aksel]

Apologies if my PR breaks any conventions or contribution guidelines. I was a bit confused by the docs, as they seemed to be targeted towards contributing features, which I don't think this is.

Let me know if I should close, resubmit, or change anything

Thanks! :smile:

[aksel]

My specific use case is this:

import pytest
from testcontainers.compose import DockerCompose

@pytest.fixture(scope="session")
async def aws() -> DockerCompose:
    with DockerCompose(
        ".",
        compose_file_name="docker-compose.yaml",
        pull=True,
        build=True,
        services=["aws"],
        # Wait for localstack to be healthy
        wait=True,
    ) as compose:
        yield compose

@pytest.fixture(scope="module")
async def db(aws) -> DockerCompose:
    with DockerCompose(
        ".",
        compose_file_name="docker-compose.yaml",
        pull=True,
        build=True,
        # Only start the DB
        services=["db"],
        # Wait for the DB to be healthy
        wait=True,
    ) as compose:
        yield compose

Starting up aws takes a while, maybe around 20 seconds, but it can be session scoped and only done once. Until now, both have been session scoped. But now I want to get a clean DB in between modules (or packages, more likely). Nicer isolation and all that. But I couldn't figure out a way to stop only db, while keeping aws running. At first glance, seemed like an oversight, so I thought I might as well submit a PR with the two-line change.

[codecov[bot]]

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