Ah ok, I thought disabling the cache with APPVEYOR_CACHE_SKIP_RESTORE as true will trigger a successful build and in the end it will store the new set of artifacts from the recent compiler to the cache and then we can toggle the environment variable (APPVEYOR_CACHE_SKIP_RESTORE) so that for the next build artifacts built from old compiler are replaced with the newer ones resembling a cache clear. Sorry I might be wrong here and it's a workaround that I thought will work as in the other CI systems. I will be happy if it's solved through API then with the right credentials.

Thanks