Add ARM64 build, unit and system test CI jobs
We used to have ARM64 host before, but it was removed due to it's connectivity problems.
We should add ARM64 CI jobs for two reasons:
- we support the ARM64 platform and distributions are actively packaging it
- Fedora on ARM64 is one of stress test targets and we should ensure that BIND works on this platform before we proceed to later stages of the release process
This requires ARM64 host, possibly AWS, performance-wise we should be close to AMD64 hosts not to block pipelines.
OS platform should be Fedora to match stress test CI jobs.