chore: produce-worker debug — MEDIA_DEBUG_STDERR=1 routes ffmpeg stderr to /tmp/ffmpeg-debug.log

infra/occupymedia/docker-compose.app.yml

@@ -176,6 +176,7 @@ services:
       <<: *appenv
       MEDIA_WORKER_LANE: local
       MEDIA_SCRATCH_DIR: /var/lib/media-worker/produce
+      MEDIA_DEBUG_STDERR: "1"
     volumes: [mediaworkerstate:/var/lib/media-worker]
     depends_on:
       postgres: { condition: service_healthy }