Release 8.7.0

What's Changed

• document how to do custom builds by @deitch in #2716
• Unit-tests fixes by @giggsoff in #2717
• Fix diag output when proxy is configured by @milan-zededa in #2709
• Fix handling of a disabled lastresort config by @milan-zededa in #2710
• Force unmount container rootfs by @giggsoff in #2718
• pkg/mkimage-raw-efi/make-raw: Fix comments by @rene in #2722
• Check zvols existence in zfsmanager by @giggsoff in #2712
• Fix object provided as argument of DeleteLogObject by @giggsoff in #2714
• Docs and errors about keys with slashes by @giggsoff in #2725
• Update containerd runtime to v2 by @giggsoff in #2719
• Reduce workflows run time by @giggsoff in #2721
• Wait more for newlog and vlans by @giggsoff in #2724
• Add error counters collection and metrics for vdev from ZFS by @vk-en in #2645
• dom0-ztools: Add version command by @rene in #2726

Full Changelog: 8.6.0...8.7.0