feat: configure docker image deployment with Gitea Container Registry

- Replace local build with pre-built image from Gitea registry
- Add docker-compose.override.yml for local development with Dockerfile
- Add .dockerignore to exclude unnecessary files from build
- Update image reference to gitea.onecluster.org/oneteam/don_confiao_backend:latest

Refs #37

docker-compose.override.yml

@@ -0,0 +1,11 @@
+services:
+  django:
+    build:
+      context: ./
+      dockerfile: django.Dockerfile
+    volumes:
+      - ./tienda_ilusion:/app/
+    env_file:
+      - .env
+    ports:
+      - "7000:9090"