feat: enable multiple target branches for batching MRs (#267)

[sg70]

In order to support batch jobs in parallel, the batch branches need to be tied to the target branch name.

Signed-off-by: Sascha Binckly [email protected]

[sg70]

@qqshfox we have used this custom version for a couple of month without any issue. It would be nice to have this merged into the project.