Shared command line, logging, and build identity for the gunnar binaries.
Part of [Gunnar](https://gunnar.rs), a git server and git client. Source:
<https://gunnar.rs/repo/gunnar/gunnar>.
License: AGPL-3.0-only, or a commercial licence granted jointly by Ignalina ApS and
Vetra Automation AB (gunnar@gunnar.rs).