Fix milestone sharing and test worker routing

docker-compose.test.yml

@@ -65,6 +65,15 @@ services:
       - test-internal
       - qrmaster-network
 
+  social-worker:
+    container_name: qrmaster-test-social-worker
+    environment:
+      # Never resolve the ambiguous `web` alias on the shared production
+      # network. The test container name is unique on this Docker daemon.
+      QRMASTER_API_BASE: http://qrmaster-test-web:3000
+    networks: !override
+      - test-internal
+
   adminer:
     container_name: qrmaster-test-adminer
     ports: !reset []