Try using fixture request to make sure docker only starts if it's needed.

Author: acerathereinspirative-nhs-nvir

tests/integration/conftest.py

@@ -19,10 +19,14 @@
 
 
 @pytest.fixture(scope="session")
-def localstack(docker_ip, docker_services) -> URL:
+def localstack(request) -> URL:
     if url := os.getenv("RUNNING_LOCALSTACK_URL", None):
         logger.info("localstack already running on %s", url)
         return URL(url)
+
+    docker_ip = request.getfixturevalue("docker_ip")
+    docker_services = request.getfixturevalue("docker_services")
+
     logger.info("Starting localstack")
     port = docker_services.port_for("localstack", 4566)
     url = URL(f"http://{docker_ip}:{port}")