v2.6.27

IMPROVEMENTS

• add config option configuration_backup_always (default false), fix 1180
• add clean_local_broken CLI command and POST /backup/clean/local_broken REST API, fix 1178
• create pid file in /tmp/clickchouse-backup.backup_name.pid to avoid parallel work for the same backup even when allow_parallel: true, fix 966

BUG FIXES

• fix race condition for server --watch command, fix 1177