Skip the version-checker-workflow outside of GatherPress org

[carstingaxion]

Currently, the WordPress version checker workflow runs on every PR, even when made from outside the GatherPress organization.

I'd like to prevent this workflow to run on forks outside of the GatherPress organization, because the required permission to create an issue would not be given and the workflow would fail.

Description of the Change

Using a condition check, to test for the GatherPress org will skip the test for every PR, that is opened from an external namespace.

Closes #

How to test the Change

1. Fork GatherPress into your namespace
2. Create a new branch, commit and publish some changes
3. open a PR to merge your new branch into the main branch
4. See the workflow to be skipped, like I did.

Changelog Entry

Changed - Prevent the WordPress version checker workflow to run & fail for PRs from outside the GatherPress organization.

Credits

Props @carstingaxion

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[what-the-diff]

PR Summary

• Improved Workflow Condition
  The update has added a condition check to the system workflow that ensures it only runs within the GatherPress organization. This prevents the workflow from inadvertently running on forked versions of the code outside our organization. This added restriction is expected to increase the security and controlled operation of the system.

[carstingaxion]

I wanted to add, that the described behaviour happened to me within the last PRs, like here:

https://github.com/GatherPress/gatherpress/actions/runs/8173255162/job/22345326819?pr=585