[skara] RFR: vcs: add support for pushing single tag

[Robin Westberg]

On Fri, 12 Mar 2021 14:56:31 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that adds support to `Repository` for pushing a single tag. This is a bit hard to test with `HgRepository` given that tags in Mercurial are just commits, so I only added a test case for `GitRepository`.
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/1052