Simplify GitHub PR reviewing with bot builds

[Paul Spooren]

Hi all,

I've just added a new feature to our GitHub workflow: members of the “Reviewers” group can now trigger targeted builds by commenting on a Pull Request. If the build completes successfully, a bot will automatically post the result as a comment on the PR.

This capability has been requested multiple times, and I’m not sure why it took me so long—but it’s finally here, and I hope it helps streamline your work.

Here are two examples in action:

- https://github.com/openwrt/openwrt/pull/19203
- https://github.com/openwrt/openwrt/pull/19216

If you're in the “Reviewers” group, simply comment with the format:

    build <target>/<subtarget>/<profile>

That’s it, this will trigger the corresponding build. For now, the format is intentionally simple. In the future, we might allow commit-based triggers or additional options.

If you'd like to be added to the group, feel free to reach out. Note that this group only has permission to trigger builds, it doesn’t grant any additional privileges. I've limited access because each build takes roughly an hour, so we want to avoid unnecessary load.

Best regards,
Paul
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