borgmatic 1.5.6

• #292: Allow before_backup and similiar hooks to exit with a soft failure without altering the
  monitoring status on Healthchecks or other providers. Support this by waiting to ping monitoring
  services with a "start" status until after before_* hooks finish. Failures in before_* hooks
  still trigger a monitoring "fail" status.
• #316: Fix hang when a stale database dump named pipe from an aborted borgmatic run remains on
  disk.
• #323: Fix for certain configuration options like ssh_command impacting Borg invocations for
  separate configuration files.
• #324: Add "borgmatic extract --strip-components" flag to remove leading path components when
  extracting an archive.
• Tweak comment indentation in generated configuration file for clarity.
• Link to Borgmacator GNOME AppIndicator from monitoring documentation.