fix(python): skip Docker container management when WIREMOCK_URL is set (fern-api#13625)

fix(python): skip Docker container management when WIREMOCK_URL is set

When WIREMOCK_URL environment variable is already set (e.g., by a CI/CD
pipeline providing an external WireMock sidecar container), skip starting
and stopping the Docker container. This matches the behavior of the PHP,
Ruby, and Rust SDK generators.

Author: iamnamananand996

generators/python-v2/sdk/src/wire-tests/WireTestSetupGenerator.ts

@@ -384,6 +384,7 @@ import subprocess
 import pytest
 
 _STARTED: bool = False
+_EXTERNAL: bool = False  # True when using an external WireMock instance (skip container lifecycle)
 _WIREMOCK_URL: str = "http://localhost:8080"  # Default, will be updated after container starts
 _PROJECT_NAME: str = "${projectName}"
 
@@ -410,10 +411,19 @@ def _get_wiremock_port() -> str:
 
 def _start_wiremock() -> None:
     """Starts the WireMock container using docker-compose."""
-    global _STARTED, _WIREMOCK_URL
+    global _STARTED, _EXTERNAL, _WIREMOCK_URL
     if _STARTED:
         return
 
+    # If WIREMOCK_URL is already set (e.g., by CI/CD pipeline), skip container management
+    existing_url = os.environ.get("WIREMOCK_URL")
+    if existing_url:
+        _WIREMOCK_URL = existing_url
+        _EXTERNAL = True
+        _STARTED = True
+        print(f"\\nUsing external WireMock at {_WIREMOCK_URL} (container management skipped)")
+        return
+
     print(f"\\nStarting WireMock container (project: {_PROJECT_NAME})...")
     try:
         subprocess.run(
@@ -434,6 +444,10 @@ def _start_wiremock() -> None:
 
 def _stop_wiremock() -> None:
     """Stops and removes the WireMock container."""
+    if _EXTERNAL:
+        # Container is managed externally; nothing to tear down.
+        return
+
     print("\\nStopping WireMock container...")
     subprocess.run(
         ["docker", "compose", "-f", _COMPOSE_FILE, "-p", _PROJECT_NAME, "down", "-v"],

generators/python/sdk/versions.yml

@@ -1,5 +1,16 @@
 # yaml-language-server: $schema=../../../fern-versions-yml.schema.json
 # For unreleased changes, use unreleased.yml
+- version: 5.0.3
+  changelogEntry:
+    - summary: |
+        Skip Docker container management in generated `tests/conftest.py` when the
+        `WIREMOCK_URL` environment variable is already set. This allows wire tests to
+        run in CI/CD pipelines that provide an external WireMock sidecar container
+        without requiring Docker-in-Docker support.
+      type: fix
+  createdAt: "2026-03-17"
+  irVersion: 65
+
 - version: 5.0.2
   changelogEntry:
     - summary: |