This is meant to record in Radicle that automated "jobs" have been run
on a repository. The job might be, for example, a CI run that builds
the software and runs its tests. The recording is done in a "job COB",
which can be in three states:
* fresh -- when the job has been triggered, but has not yet started running
* running -- when it's running
* finished -- when it's finished running
The finished state also records whether the job was successful or if
it failed.
A job COB records the git commit that it runs on, and the "run ID" of
the job. The run ID represents an external identifier, such as one
assigned by a remote CI system. The COB can optionally store a URL
related to the job, such as to the build log from CI.
Add the "rad job" subcommand to create and manage job COBs. For
production use, the COBs should be created and updated using
`heartwood` as a library instead of running "rad job", if at all
possible. However, "rad job list" lists the jobs that have been run on
the repository.
The COB type name is xyz.radicle.beta.job, until we've gained
experience with the COB and its implementation and are ready to
declare it stable.
Signed-off-by: Lars Wirzenius <liw@liw.fi>
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