RFR: 7903500: Add Gradle Wrapper Validation workflow to jtreg

[Kevin Rushforth]

On Tue, 20 Jun 2023 14:43:52 GMT, Christian Stein <cstein at openjdk.org> wrote:

> This change adds a workflow to this repository to verify that any and all `gradle-wrapper.jar` files in the repository match the SHA-256 checksums of any of our official releases. See details at https://github.com/marketplace/actions/gradle-wrapper-validation

Looks good except for a comment I left about the "on" step.

.github/workflows/gradle-wrapper-validation.yml line 2:

> 1: name: 'Validate Gradle Wrapper'
> 2: on: [push, pull_request]

The on `pull_request` will be ineffective, since this only ever runs in the context of a contributor's personal fork. Also, you will want to exclude the master branch and any pr branches, as is done in [test.yml](https://github.com/openjdk/jtreg/blob/master/.github/workflows/test.yml#L3C1-L8C1), to avoid unnecessary test runs.

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PR Review: https://git.openjdk.org/jtreg/pull/159#pullrequestreview-1495388295
PR Review Comment: https://git.openjdk.org/jtreg/pull/159#discussion_r1239970705