Update existing tests and test actual pruning

test/lock/docker-compose.yml

@@ -4,7 +4,7 @@ services:
     restart: always
     environment:
       BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
-      BACKUP_RETENTION_DAYS: '7'
+      BACKUP_RETENTION_PERIOD: 168h
     volumes:
       - app_data:/backup/app_data:ro
       - /var/run/docker.sock:/var/run/docker.sock

test/lock/run.sh

@@ -13,7 +13,7 @@ sleep 5
 
 ec=0
 
-docker compose exec -e BACKUP_RETENTION_DAYS=7 -e BACKUP_FILENAME=test.tar.gz backup backup & \
+docker compose exec -e BACKUP_RETENTION_PERIOD=168h -e BACKUP_FILENAME=test.tar.gz backup backup & \
   { set +e; sleep 0.1; docker compose exec -e BACKUP_FILENAME=test2.tar.gz -e LOCK_TIMEOUT=1s backup backup; ec=$?;}
 
 if [ "$ec" = "0" ]; then