update COMPOSE_VERSION to c1b

containers/cluster_node/entrypoint.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 set -e
 
+if [[ "$COMPOSE_VERSION" != "c1b" ]]; then
+    echo "ERROR: Please upgrade your docker compose file. Exiting."
+    exit 1
+fi
+
 # Set Timezone
 if [ -n "$TZ" ]; then
     ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone