add foundation libc to CI #157

Job	Run time
Dry Run Packaging	25s
Build (ubuntu-latest)	18s
Build Website	23s
Build (windows-latest)	1m 1s
Build Examples (espressif/esp)	21s
Check that stm32 generated code is up to date	37s
Build (macos-latest)	26s
Build Examples (gigadevice/gd32)	16s
Build Examples (microchip/avr)	19s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	28s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	31s
Build Examples (microchip/atsam)	16s
Unit Test Regz (ubuntu-latest)	19s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	19s
Unit Test UF2 (ubuntu-latest)	25s
Build Examples (nordic/nrf5x)	18s
Unit Test Regz (windows-latest)	1m 14s
Unit Test UF2 (windows-latest)	1m 0s
Build Examples (nxp/lpc)	18s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 10s
Unit Test Regz (macos-latest)	29s
Unit Test UF2 (macos-latest)	26s
Build Examples (stmicro/stm32)	22s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 11s
Build Examples (raspberrypi/rp2xxx)	22s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 13s
Unit Test Ports (macos-latest, gigadevice/gd32)	25s
Validate Foundation Libc (ubuntu-latest)	13s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	31s
Validate Foundation Libc (windows-latest)	1m 11s
Unit Test Ports (macos-latest, stmicro/stm32)	23s
Validate Foundation Libc (macos-latest)	19s
	17m 29s

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