add foundation libc to CI #161

Job	Run time
Check that stm32 generated code is up to date	45s
Unit Test UF2 (ubuntu-latest)	19s
Unit Test UF2 (windows-latest)	1m 31s
Unit Test UF2 (macos-latest)	27s
Build Website	24s
Build (ubuntu-latest)	27s
Build Examples (espressif/esp)	2m 9s
Build (windows-latest)	1m 11s
Build Examples (gigadevice/gd32)	2m 5s
Build (macos-latest)	28s
Unit Test Regz (ubuntu-latest)	20s
Build Examples (microchip/avr)	2m 8s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	25s
Unit Test Regz (windows-latest)	1m 16s
Build Examples (microchip/atsam)	2m 7s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	37s
Unit Test Regz (macos-latest)	28s
Build Examples (nordic/nrf5x)	2m 1s
Validate Foundation Libc (ubuntu-latest)	17s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	15s
Build Examples (nxp/lpc)	1m 58s
Validate Foundation Libc (windows-latest)	1m 5s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 26s
Build Examples (stmicro/stm32)	26s
Validate Foundation Libc (macos-latest)	27s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 6s
Build Examples (raspberrypi/rp2xxx)	2m 17s
Unit Test Ports (windows-latest, stmicro/stm32)	49s
Unit Test Ports (macos-latest, gigadevice/gd32)	26s
Dry Run Packaging	48s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	32s
Unit Test Ports (macos-latest, stmicro/stm32)	24s
	31m 24s

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