Improve the comment for the base-minimal job
We actually do run ARA in minimal since it can't (yet) be tested
outside of base and add notes on the purpose of the jobs.
A subset of what the 'base' job provides: the absolute minimum considered
required to run for any one job.
It doesn't set up cached git repositories, will not set up mirrors,
- doesn't validate the node and does not generate an ARA report.
+ doesn't validate the node, etc.
+ It is meant to be used, amongst other things, to test roles and
+ playbooks that would otherwise be included by default as part of the
+ 'base' job.
These tasks, if required, can be included by the dependant jobs
themselves on a need basis.
pre-run: playbooks/base-minimal/pre
