chore(release): add v1.0.0 versioning, release workflow, and versioned docker image

- Add VERSION file (1.0.0)
- Add GitHub Actions release workflow to build and push Docker images to ghcr.io
- Update docker-compose.yml to pull ghcr.io/cqrenet/aoc-backend:v1.0.0 by default

docker-compose.yml

@@ -12,7 +12,8 @@ services:
       - mongo_data:/data/db
 
   backend:
-    build: ./backend
+    # For local development you can switch back to: build: ./backend
+    image: ghcr.io/cqrenet/aoc-backend:v1.0.0
     container_name: aoc-backend
     restart: always
     env_file: