RFR: 8293338: Enable manually triggering the GitHub workflow

[Kevin Rushforth]

On Sat, 3 Sep 2022 09:56:04 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> Hi all,
> 
> In [8293214: Add support for Linux/LoongArch64](https://github.com/openjdk/jfx/pull/888), the contributor was suggested  to push a empty commit to trigger the GHA tests. But actually it seems not a good dev flow because the newly added commits are not related to the issue the patch want to solve.
> 
> The GitHub provides related configuration to enable the develoers to trigger the workflow manually. Please see the documents [1][2] for more detail. This patch adds such config to enable it.
> 
> Thanks for taking the time to review.
> 
> [1] https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow
> [2] https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_dispatch
> 
> Best Regards,
> -- Guoxiong

This seems fine. I see that the [jdk](https://github.com/openjdk/jdk) repo already enables [manually triggering the GHA workflow](https://github.com/openjdk/jdk/blob/master/.github/workflows/main.yml#L33). I tested it in my repo and it works as expected.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.org/jfx/pull/891