Add regz/uf2 release build option #29

Job	Run time
Build Website	20s
Dry Run Packaging	1m 21s
Build Examples (espressif/esp)	2m 23s
Check that stm32 generated code is up to date	43s
Build Examples (gigadevice/gd32)	2m 12s
Unit Test Regz (ubuntu-latest)	17s
Build Examples (microchip/avr)	2m 14s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	16s
Unit Test Regz (windows-latest)	1m 0s
Unit Test UF2 (ubuntu-latest)	16s
Build Examples (microchip/atsam)	2m 8s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	24s
Unit Test Regz (macos-latest)	31s
Unit Test UF2 (windows-latest)	1m 13s
Build Examples (nordic/nrf5x)	2m 6s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	21s
Unit Test UF2 (macos-latest)	22s
Build Examples (nxp/lpc)	1m 57s
Unit Test Ports (windows-latest, gigadevice/gd32)	53s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	53s
Build Examples (stmicro/stm32)	32s
Unit Test Ports (windows-latest, stmicro/stm32)	55s
Build Examples (raspberrypi/rp2xxx)	2m 29s
Unit Test Ports (macos-latest, gigadevice/gd32)	25s
Build Examples (wch/ch32v)	2m 19s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	28s
Unit Test Ports (macos-latest, stmicro/stm32)	27s
	29m 25s

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