fix(campaign): honor acceptance temp selection

dev/mail-testbed/run_celery_redelivery_acceptance.py

@@ -587,6 +587,12 @@ def _runtime_module_versions(registry: Any) -> dict[str, str]:
     return versions
 
 
+def _create_runtime_root() -> Path:
+    """Create the isolated runtime under the platform-selected temp root."""
+
+    return Path(tempfile.mkdtemp(prefix="govoplan-campaign-celery-redelivery-"))
+
+
 def _bootstrap_and_run(
     *,
     settings: TestbedSettings,
@@ -594,9 +600,7 @@ def _bootstrap_and_run(
     redis_url: str,
     visibility_timeout_seconds: int,
 ) -> dict[str, Any]:
-    runtime_root = Path(
-        tempfile.mkdtemp(prefix="govoplan-campaign-celery-redelivery-", dir="/tmp")
-    )
+    runtime_root = _create_runtime_root()
     database = None
     try:
         os.environ.update(

tests/test_celery_redelivery_acceptance.py

@@ -172,6 +172,19 @@ def test_worker_bootstrap_uses_real_late_ack_solo_celery_worker() -> None:
     assert "send_email.run" not in source
 
 
+def test_runtime_root_uses_platform_temp_selection() -> None:
+    with mock.patch(
+        "govoplan_campaign_celery_redelivery_acceptance.tempfile.mkdtemp",
+        return_value="/selected-temp/govoplan-campaign-celery-redelivery-test",
+    ) as mkdtemp:
+        runtime_root = runner._create_runtime_root()
+
+    assert runtime_root == Path(
+        "/selected-temp/govoplan-campaign-celery-redelivery-test"
+    )
+    mkdtemp.assert_called_once_with(prefix="govoplan-campaign-celery-redelivery-")
+
+
 def test_worker_log_projection_matches_redelivered_task_without_retaining_id() -> None:
     with tempfile.TemporaryDirectory() as temporary_directory:
         log_path = Path(temporary_directory) / "worker.log"