backups: Run compact in cleanup

Tests:

- Enable scheduled backups for root and remote repo. Modify
  schedule.py so that backups and cleanup will run every 2
  minutes. Log shows compact command is run for both
  /var/lib/freedombox/borgbackup and mount location for remote
  repo. No errors shown in log.

Closes: #2380

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

freedombox/modules/backups/privileged.py

@@ -316,6 +316,12 @@ def delete_archive(path: str, encryption_passphrase: secret_str | None = None):
     _run(['borg', 'delete', path], encryption_passphrase)
 
 
+@privileged
+def compact(path: str):
+    """Compact segments and free repo disk space."""
+    _run(['borg', 'compact', path])
+
+
 def _extract(archive_path, destination, encryption_passphrase, locations=None):
     """Extract archive contents."""
     prev_dir = os.getcwd()

freedombox/modules/backups/repository.py

@@ -81,9 +81,9 @@ class BaseBorgRepository(abc.ABC):
     def prepare():
         """Prepare the repository for operations."""
 
-    @staticmethod
-    def cleanup():
+    def cleanup(self):
         """Cleanup the repository after operations."""
+        privileged.compact(self.borg_path)
 
     def get_info(self):
         """Return Borg information about a repository."""
@@ -317,6 +317,7 @@ class SshBorgRepository(BaseBorgRepository):
 
     def cleanup(self):
         """Cleanup the repository after operations by unmounting."""
+        super().cleanup()
         self._umount_ignore_errors()
 
     @property