set postgres version number

database/docker-compose.yml

@@ -3,7 +3,7 @@ version: '3.5'
 services:
   postgres:
     container_name: postgres_container
-    image: postgres
+    image: postgres:15
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-acedanger}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-changeme}