feat(copr): add `follow_fedora_branching`

[mfocko]

Related to packit/packit#1970

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/58243006269d4cddb218bb1594c4ee9d

:heavy_check_mark: pre-commit SUCCESS in 1m 19s :heavy_check_mark: hugo SUCCESS in 1m 07s

[softwarefactory-project-zuul[bot]]

Build failed (gate pipeline).

https://softwarefactory-project.io/zuul/t/packit-service/buildset/0b29e23a66494fff9dc074b0a20b5ec1

:x: pre-commit FAILURE in 2m 45s

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/0d08bafb2dc748288e6b1206c014490c

:heavy_check_mark: pre-commit SUCCESS in 1m 29s :heavy_check_mark: hugo SUCCESS in 1m 16s

[softwarefactory-project-zuul[bot]]

Build failed (gate pipeline).

https://softwarefactory-project.io/zuul/t/packit-service/buildset/397fb6a9e44f42c9ac0afed04c267434

:x: pre-commit FAILURE in 4m 36s

[mfocko]

regate

[softwarefactory-project-zuul[bot]]

Build succeeded (gate pipeline). https://softwarefactory-project.io/zuul/t/packit-service/buildset/0c9641f7ab9349199df3b144df3d7778

:heavy_check_mark: pre-commit SUCCESS in 1m 38s