Add option to fail action if test coverage % declines by certain amount

[joyt]

Idea

Would like a way for this action to fail IF the test coverage % declines by a minimum percent

Description

Add option to fail action if test coverage % declines

Alternatives

Potentially easier / more general solution:
If there's a way to get a machine-parseable summary of test coverage (e.g. JSON), including the % changes, as an output variable, then a subsequent workflow step and can read/parse that output and do arbitrary logic to fail/pass the workflow.

^ Why not parse the output: 'report_markdown' output? Currently the 'report_markdown' option conflicts with the 'comment' option, which doesn't work for my use case because I want to have the comment added, and ALSO get the test coverage diff %. Also the markdown output is not a good format for further programmatic logic, so an output in JSON or something similar would be preferred.

[collagenial]

This enhancement would be very welcome.

[JamesBrightman-pp]

Can this be re-opened? This is an extremely valuable addition and a much better way to test coverage changed in a larger existing app than static thresholds (imo).