Add nosync to images
This adds the
nosync shim library to Docker and Packer images used in BIND9 CI (bind9#2752 (closed)). The library upstream project is at https://github.com/kjn/nosync but as additional changes are needed my fork is used (it's similar to how we fetch Kyua sources).
BIND9 CI code: bind9!5213 (closed).
- Docker images: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/75320
- QCOW2 images: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/75294