fix([2fd8f42]): enforce dedicated docker network for service discovery

heatmap-tool/docker-compose.yml

@@ -7,6 +7,8 @@ services:
       - "8002:8000"
     volumes:
       - ./backend:/app
+    networks:
+      - heatmap-net
 
   frontend:
     build: ./frontend
@@ -14,4 +16,13 @@ services:
       - "5173:5173"
     volumes:
       - ./frontend:/app
-      - /app/frontend/node_modules # prevent host node_modules from overwriting container
+      - /app/frontend/node_modules
+    networks:
+      - heatmap-net
+    depends_on:
+      - backend
+
+networks:
+  heatmap-net:
+    driver: bridge
+ # prevent host node_modules from overwriting container