L2SS-497: Fix IERS volume for beam device

docker-compose/device-beam.yml

@@ -19,14 +19,13 @@ services:
     container_name: ${CONTAINER_NAME_PREFIX}device-beam
     networks:
       - control
-    volumes:
-      - iers-data:/opt/IERS
     ports:
       - "5711:5711" # unique port for this DS
     extra_hosts:
       - "host.docker.internal:host-gateway"
     volumes:
       - ..:/opt/lofar/tango:rw
+      - iers-data:/opt/IERS
     environment:
       - TANGO_HOST=${TANGO_HOST}
     working_dir: /opt/lofar/tango