feat(service): add Docker Compose configuration for database

Introduce a docker-compose.yml file to manage the PostgreSQL database container. This setup includes environment variables, port configuration, and volume mapping for persistent data storage.

docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3'
+
+services:
+  database:
+    container_name: "app-db"
+    image: 'postgres:latest'
+    env_file:
+      - .env
+    ports:
+      - "${POSTGRES_PORT}:5432"
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: ${POSTGRES_DATABASE}
+    volumes:
+      - './db-data/:/var/lib/postgresql/data/'