ci: when an integration test fail, dump the log

[sylvestre]

Of course, it also means that we have to enable logging.

So, probably export in env:

SCCACHE_LOG=sccache=debug SCCACHE_ERROR_LOG=/tmp/sccache.log

Example when it would have been useful:
https://github.com/mozilla/sccache/actions/runs/4508809361/jobs/7938014339

[NakanoMiku39]

Hello is this bug fixed?
btw the example is expired