chore: set application to validate mode and add database initialization script

docker-compose.yml

@@ -23,6 +23,7 @@ services:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
     volumes:
       - rest-email-bridge-db-data:/var/lib/postgresql/data
+      - ./infrastructure/src/main/resources/db-scripts:/docker-entrypoint-initdb.d
     networks:
       - network