[RFE] mock configuration and sources repos

[sergiomb2]

Recently I saw that mock-core-configs/etc/mock/templates/fedora-branched.tpl have sources repos but is missing sources repos of updates-testing [1]
May be we should have a template dedicates just to source repos /etc/mock/templates/fedora-branched-source.tpl

Have sources repos could help on dep rpm checker ( https://pagure.io/fork/sergiomb/releng/blob/main/f/scripts/orphaned-packages-process/dep_checker.py ) to read easily source repos using mock configuration .

[1]
[fedora-source]
[updates-source]

[kwizart]

Sure, we can have source repository in our mock configuration file