🐛 fix: add shared network configuration for Docker Compose services

- Add dance-lessons-coach-network to both compose files
- Ensure build-cache and postgres containers can communicate
- Fix container-to-container connectivity
- Maintain same network name for consistency

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

docker-compose.build.yml

@@ -13,4 +13,11 @@ services:
     environment:
       - GOPATH=/go
       - PATH=/go/bin:/usr/local/go/bin:/usr/local/bin:/usr/bin:/bin
-    restart: unless-stopped
+    networks:
+      - dance-lessons-coach-network
+    restart: unless-stopped
+
+networks:
+  dance-lessons-coach-network:
+    name: dance-lessons-coach-network
+    driver: bridge

docker-compose.yml

@@ -15,6 +15,8 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
+    networks:
+      - dance-lessons-coach-network
     restart: unless-stopped
 
   # Application service (for reference)
@@ -37,4 +39,9 @@ services:
 
 volumes:
   postgres_data:
-    driver: local
+    driver: local
+
+networks:
+  dance-lessons-coach-network:
+    name: dance-lessons-coach-network
+    driver: bridge