Add Alastair's Pi Compute Module blade server

[geerlingguy]

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Redditor Alastair posted this CM4 blade server design to the homelab subreddit, and it looks amazing!

It's 2U, and allows for up to 10 blades (Blade 4A), with each blade supporting eMMC or Lite CM4, with an onboard RTC/battery and NVMe M.2 E-Key slot. Externally there's HDMI, USB 2.0, and 1 Gbps Ethernet, and a little OLED display. The 2U enclosure has more management and a nice little color OLED too! Looks beautiful, like the 'fancy' version of Uptime Lab's 1U blade enclosures :)