adding network to the .dev.yml

docker-compose.emg.dev.yml

 version: "3.6"
 services:
   database:
+    networks:
+      - extnet
     ports:
       - "5432:5432"
   client:
@@ -42,3 +44,7 @@ services:
       - type: bind
         source: ./preprocessor/
         target: /preprocessor/
+  networks:
+    extnet:
+      name: emg-extnet
+      external: true
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