Various tracking tools for diffutils

Tracking the evolution of https://github.com/uutils/diffutils

GNU testsuite comparison

Below is the evolution of how many GNU tests uutils/diffutils passes.

Refreshed twice a day by github actions. Changes are documented in the json file (gnu-result.json).

The workflow and the graph are shared with the other uutils tracking repositories, see uutils-tracking.

Compares only the Linux execution.

Based on:

• https://github.com/uutils/diffutils/blob/main/tests/run-upstream-testsuite.sh