This is a restart of #1226 which was rejected 3 years ago.
Currently, if component refs are not specified, we default to conf.default_branch, which isn't really useful to anyone. @vondruch suggests using the branch name for the submitted build.
conf.default_branch
This feature has been implemented in #1760, depending on #1746.
Here is Fedora infrastructure ticket asking deployment of this feature:
https://pagure.io/fedora-infrastructure/issue/11042
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