chore(core): Adds integration testing to the private registry auth feature (DOCKER_AUTH_CONFIG)

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Follow up on #566 - Testing using the registry module

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Also fiddled with

+fromunittestimportmock+fromdocker.errorsimportNotFoundfromtestcontainers.core.containerimportDockerContainerfromtestcontainers.core.docker_clientimportDockerClientfromtestcontainers.core.waiting_utilsimportwait_container_is_ready+fromtestcontainers.core.configimporttestcontainers_configascfromtestcontainers.registryimportDockerRegistryContainer
@@ -31,8+34,7 @@ deftest_missing_on_private_registry(monkeypatch):
# prepare auth configcreds: bytes=base64.b64encode(f"{username}:{password}".encode("utf-8"))
config= {"auths": {f"{registry_url}": {"auth": creds.decode("utf-8")}}}
-monkeypatch.setenv("DOCKER_AUTH_CONFIG", json.dumps(config))
-assertos.environ.get("DOCKER_AUTH_CONFIG"), "DOCKER_AUTH_CONFIG not set"+mock.patch.object(c, "_docker_auth_config", json.dumps(config))

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Nicely done @alexanderankin , thank you 🙏