Document what parts of BuildStream / plugins depend on host packages
AFAIK, we depend on
- host's ssh to push to the bst cache
- host's bubblewrap for sandboxing
- host's ostree for caching artifacts
Also, this plugins:
- patch depends on host's patch
- tar depends on host's lzip
- git depends on host's git
- bzr depends on host's bzr
Edited by Tristan Van Berkom