feat(selfhost): start full updates from administration

docker-compose.selfhost.yml

@@ -86,6 +86,9 @@ services:
     image: git.federspiel.tech/flfeders/fedeo/backend:${FEDEO_VERSION:-dev}
     container_name: fedeo-backend
     restart: unless-stopped
+    volumes:
+      # Mount the directory so a service restart can replace the Unix socket.
+      - /run/fedeo-updater:/run/fedeo-updater:ro
     depends_on:
       db:
         condition: service_healthy