[scl.org] RPM list builder & RHSCL rebuild recipes

[Nick Coghlan]

In putting together the todo list for the sclo-python SCL, Red Hat's
Python maintenance team pointed me towards some of the tools used to
maintain the Red Hat SCLs:
https://github.com/ncoghlan/pyscl-devel/issues/1#issuecomment-315037884

In particular, RPM List Builder automates running through a series of
packages builds based on a YAML recipe file:
https://github.com/sclorg/rpm-list-builder/blob/master/docs/users_guide.md

That then allows the build sequence for an SCL (including any required
bootstrapping builds) to be automated. For example, the Python 3.5 SCL
build sequence:
https://github.com/sclorg/rhscl-rebuild-recipes/blob/master/python.yml#L87

These aren't currently mentioned in the SCL guide or on the SCLo-SIG
wiki, so I figured I'd start by posting a message about them here, and
then after I have the sclo-python SCL up and running try to come up
with some suitable documentation updates.

Cheers,
Nick.

-- 
Nick Coghlan
Red Hat Platform Engineering, Brisbane