In TER the DFG-Viewer extension exists, but it is outdated and not synchronized with the existing releases and TYPO3 versions.
https://extensions.typo3.org/extension/dfgviewer

Solution:

• All released versions should be available in TER
• Informations should be updated

For a potential automation: Maybe the solution of this issue can be reused.
kitodo/kitodo-presentation#1354