fix: Build Docker image locally instead of pulling from registry

- Change docker-compose.prod.yml from image: to build: configuration
- Remove image pulling from deployment script
- Add --build flag to docker-compose up command
- Fixes "image not found" error by building from local Dockerfile

This ensures the deployment script builds the image from source
instead of trying to pull a non-existent image from a registry.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.prod.yml

@@ -2,7 +2,10 @@ version: '3.8'
 
 services:
   bct-app:
-    image: bct-whitelabel:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: production
     container_name: bct-astro-prod
     ports:
       - "3000:3000"