RFR: mirror-bot: support mirroring of selected branches

[Kevin Rushforth]

On Tue, 24 Mar 2020 07:37:11 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

>> Hi all,
>> 
>> please review this patch that enables the mirror bot to mirror only selected
>> branches (instead of all as is done today). This is useful for projects who
>> might have a `master` that is a replica of `jdk:master`, but don't want tags
>> (nor potentially other branches) from the
>> [jdk](https://git.openjdk.java.net/jdk) repository.
>> 
>> Testing:
>> - `make test` passes on Linux x64
>> - Added a new unit test
>> 
>> Thanks,
>> Erik
>
> Looks good!

Nice. Would it be possible to have an option to also sync reachable tags, using `git push --follow-tags` in the case
where only a single branch is mirrored?

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PR: https://git.openjdk.java.net/skara/pull/536