Make this job remind devs to update the GWC/GS downstream branches when not running on the main branch (31.x test, should fail)

[aaime]

Checklist

• [ ] I have read the contribution guidelines.
• [ ] I have sent a Contribution Licence Agreement (not required for small changes, e.g., fixing typos in documentation).
• [ ] First PR targets the main branch (backports managed later; ignore for branch specific issues).
• [ ] Avoid Java 9+ split packages.
• [ ] All the build checks are green (see automated QA checks).

For core and extension modules:

• [ ] New unit tests have been added covering the changes.
• [ ] Documentation has been updated (if change is visible to end users).
• [ ] There is an issue in GeoTools Jira (except for changes not visible to end users).
• [ ] Commit message(s) must be in the form [GEOT-XYZW] Title of the Jira ticket.
• [ ] Bug fixes and small new features are presented as a single commit.
• [ ] The commit targets a single objective (if multiple focuses cannot be avoided, each one is in its own commit, and has a separate ticket describing it).

[mprins]

@aaime It seems to be working now

[aaime]

Awesome, thanks!

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed because it has not had recent activity. Please re-submit with updates if you want to resume work on this topic. Thank you for your contributions.