796a367 Add "scratch_build_only_branches" configuration options.

Authored and Committed by jkaluza 4 years ago
    Add "scratch_build_only_branches" configuration options.
    
    The goal here is to define certain branches from which only scratch
    module builds can be submitted. The main use case is for "private-*"
    branches which can be created and maintained by anyone, but there
    must not be production-ready module build created from them.
    
    This commit adds new `scratch_build_only_branches` config option
    to define the list of regexes to match such branches.