Create a CI-CD category in GitHub Discussions

[oberstet]

Bug Description

Run actions/github-script@v7
No Discussion category ID configured - skipping discussion post
To enable discussion posts:
1. Create a CI-CD category in GitHub Discussions
2. Get the category ID from the GraphQL API
3. Set it in the workflow file

see: https://github.com/crossbario/cfxdb/actions/runs/20251541212/job/58144414453

Checklist

• I have searched existing issues to avoid duplicates
• I have provided a minimal reproducible example
• I have included version information
• I have included error messages/logs