feat: pass Kafka env vars to livepeer runner subprocess

Add KAFKA_BOOTSTRAP_SERVERS, KAFKA_TOPIC, KAFKA_SASL_USERNAME, and
KAFKA_SASL_PASSWORD to the env allowlist so the inner runner's
kafka_publisher can initialize and publish stream lifecycle events.

Signed-off-by: emranemran <emran@livepeer.org>
Signed-off-by: emranemran <emran.mah@gmail.com>

Author: emranemran

src/scope/cloud/livepeer_fal_app.py

@@ -381,6 +381,11 @@ def setup(self):
             "DAYDREAM_SCOPE_BUNDLED_PLUGINS_FILE",
             "LIVEPEER_DEBUG",
             "UV_CACHE_DIR",
+            # Kafka (for scope.server.kafka_publisher in the runner subprocess)
+            "KAFKA_BOOTSTRAP_SERVERS",
+            "KAFKA_TOPIC",
+            "KAFKA_SASL_USERNAME",
+            "KAFKA_SASL_PASSWORD",
         ]
         runner_env = {k: os.environ[k] for k in env_allowlist if k in os.environ}
         runner_env.setdefault("UV_CACHE_DIR", "/tmp/uv-cache")