testing/k3s: enable s390x with golang/crypto/chacha20 support
Build and run OK with golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8
We are currently working on getting Alpine Linux 3.21 out. This means that merge requests that are not aimed to help with that (only affecting testing, new aports) have a lower priority at the moment. Please be patient, they will be eventually picked up.
Build and run OK with golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8