RFR: 1797: Add support for /backport pull request command [v3]

Zhao Song zsong at openjdk.org
Thu Feb 2 00:14:38 UTC 2023

> This patch introduces support for the /backport command in pull requests. (ErikJ and ErikH proposed the idea and came up with this implementation.)
> Usage of /backport in pull request:
> Syntax: `/backport <repo> [<branch>] ` ` /backport disable <repo> [<branch>]` (default branch is master)
> 1. If the `/backport` command is used in an **open** pull request, it adds a label `Backport=repo:branch` to the PR. If the PR is later integrated, the PR bot scans for backport labels and begins the backporting process. To cancel the backport, the user can use `/backport disable repo master` to remove the label before the PR is integrated.
> 2.  If the `/backport` command is used in an **integrated** PR, it creates the backport branch and comments on the PR. This process is similar to using the /backport command in commits. (This feature was implemented in [SKARA-1495](https://bugs.openjdk.org/browse/SKARA-1495) by guoxiong li, but the usage was not documented on the[ wiki page](https://wiki.openjdk.org/display/SKARA/Pull+Request+Commands), so seems like few people use this command)
> 3.  If the `/backport` command is used in a **closed** (not integrated) PR, the user will receive an error message stating that the command cannot be used in a closed but not integrated PR.

Zhao Song has updated the pull request incrementally with two additional commits since the last revision:

 - fix test
 - fix issues


  - all: https://git.openjdk.org/skara/pull/1466/files
  - new: https://git.openjdk.org/skara/pull/1466/files/8e6feb06..26b9e7d9

 - full: https://webrevs.openjdk.org/?repo=skara&pr=1466&range=02
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1466&range=01-02

  Stats: 147 lines in 5 files changed: 68 ins; 43 del; 36 mod
  Patch: https://git.openjdk.org/skara/pull/1466.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1466/head:pull/1466

PR: https://git.openjdk.org/skara/pull/1466

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