adding missing docker-compose edit

docker-compose.emg.yml

@@ -129,6 +129,8 @@ services:
       - env/emg_db.env
       - env/emg_obs.env
       - env/emg_redis.env
+    secrets:
+      - my_secret
     environment:
       INSTANCE_ID: "prism-view-server_registrar"
       INSTALL_DIR: "/var/www/pvs/dev/"
@@ -169,3 +171,6 @@ volumes:
   instance-data:
 networks:
   intnet:
+secrets:
+  my_secret:
+    external: true