Install overrides for debug packages on import

We created the override, but didn't actually commit it to the database,
leading the archive integrity scanner to flag these as violations later.
Oops!

src/laniakea/archive/pkgimport.py

@@ -859,6 +859,7 @@ def import_binary(
                 override.component = component
                 override.section = self._session.query(ArchiveSection).filter(ArchiveSection.name == 'debug').one()
                 override.priority = PackagePriority.OPTIONAL
+                self._session.add(override)
             elif ignore_missing_override:
                 # The override is missing, but we are supposed to ignore that fact.
                 # So we will try our very best to guess a sensible override for this binary.