RFR: 1076: Not possible to use 'Backport <sha>' if original bug doesn't have public sha [v4]

[Kevin Rushforth]

On Mon, 14 Jun 2021 19:36:21 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> This patch adds a new way of declaring a pull requests to be a backport for situations where the original hash of the original change is not known or available. Technically such a PR should already work without the backport label, but it will display a warning about the issue not being open. By being able to declare a backport, that warning will be eliminated, which should make the user experience smoother and hopefully help avoid mistakes.
>> 
>> To use the new feature, you create a PR with a title "Backport <issueid>" instead of "Backport <hash>". Once this goes live, I will update the Skara wiki documentation.
>
> Erik Joelsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Disallow /clean to work on backport PR without an original commit hash

Marked as reviewed by kcr (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1186