Add CI step to delete stale cassettes?

[ConorMacBride]

Describe the feature

If a test in this repo fails, my understanding is that the previous successful cassette will remain in this repo for use in sunpy. Is that correct?

If so, should we add a job to delete any cassettes in the repo which have a date in the HTTP header which is too old? That way tests in the sunpy repo would be forced to record a new cassette (I think?) and make the fact that the test hasn't passed recently apparent in the sunpy tests.

Proposed solution

No response

[ConorMacBride]

Currently cassettes are not updated if only the date changes. For this to work, we could have a separate JSON/YAML file at the root of this repo which records the date the test last passed. That file could be edited by the check_new_files.py script.

[Cadair]

make the fact that the test hasn't passed recently apparent in the sunpy tests.

Is that true, I was wondering the same thing here: sunpy/sunpy#6167 (comment)