L2SS-497: Retain the casacore measures on a volume to prevent them from...

L2SS-497: Retain the casacore measures on a volume to prevent them from changing on every rebuild. We want to control when they change.

docker-compose/device-beam.yml

@@ -4,6 +4,9 @@
 #
 version: '2'
 
+volumes:
+  iers-data: {}
+
 services:
   device-beam:
     image: device-beam
@@ -16,6 +19,8 @@ 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: