Use the host's user.

docker-compose.yml

@@ -5,8 +5,10 @@ services:
     build:
       context: ./
     restart: on-failure
-    user: '1000' # My (Nimrod) uid on the Kodi host.
+    user: nimrod
     volumes:
+      - /etc/group:/etc/group:ro
+      - /etc/passwd:/etc/passwd:ro
       - /srv/library/nimrod/Podcasts:/poquita/Podcasts
       - poquita:/poquita/db