Summary

Zenodo files are brittle, and invalid entries only appear after a release, when one cannot fix them anymore for the release in question.
This adds a validator.

Additional background

https://github.com/vsoch/zenodo-validator
zenodo/zenodo-rdm#1205 (comment)

Checklist

The proposed changes:

• fix a bug or incorrect behavior in AMReX
• add new capabilities to AMReX
• changes answers in the test suite to more than roundoff level
• are likely to significantly affect the results of downstream AMReX users
• include documentation in the code and/or rst files, if appropriate