go-boot v1.5

This is a release of the go-boot unikernel which implements a UEFI Shell and OS loader for AMD64 platforms, implemented as a bare metal Go unikernel using the TamaGo framework.

The unikernel can be executed as:

• EFI application by an existing loader (e.g. UEFI shell, systemd-boot)
• EFI boot entry
• QEMU plain or confidential KVM
• Google Compute Engine plain or confidential KVM

Documentation can be found in the README.

Major changes:

• cmd: added sev-kdf, commands for AMD SEV-SNP key derivation (1745d18)
• cmd: reduce OVMF page re-use for AMD SEV-SNP operations (bbcc457, 2e1b84c)
• Makefile: added qemu-snp target for Confidential VM launch under AMD SEV-SNP (92982ac)
• uefi/x64: update to usbarmory/tamago@00899b0 to fix frequency detection on AMD CPUs (ad0f71c)

Full Changelog: v1.4...v1.5