- Add vault_s3_access_key / vault_s3_secret_key to Ansible Vault
- Expose via s3_access_key / s3_secret_key in all/main.yml
- Add s3_endpoint + s3_bucket to backup role defaults
- Install awscli via apt in backup role tasks
- Extend backup.sh.j2: upload *.gz to S3 after local backup,
prune S3 objects older than backup_retention_days
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>