external-dns-app release v2.1.0

Added

• Allow the sync policy to be configured. (#60)
• Supports customisation of the txt-owner-id (whilst still defaulting for default apps). (#60)
• Supports dry-run mode and warns the user if enabled. (#60)

Changed

• Rework the way the txt prefix is generated (whilst still defaulting for default apps). (#60)
• Rework how the annotation filter value is generated (whilst still defaulting for default app). (#60)