add foundation libc to CI #160

Job	Run time
Build (ubuntu-latest)	21s
Dry Run Packaging	30s
Build Examples (espressif/esp)	2m 18s
Build Website	23s
Build Examples (gigadevice/gd32)	2m 17s
Build Examples (microchip/avr)	2m 13s
Check that stm32 generated code is up to date	47s
Build (windows-latest)	1m 31s
Build Examples (microchip/atsam)	2m 16s
Build (macos-latest)	28s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	17s
Build Examples (nordic/nrf5x)	1m 58s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	33s
Unit Test Regz (ubuntu-latest)	20s
Build Examples (nxp/lpc)	1m 56s
Unit Test Regz (windows-latest)	1m 45s
Unit Test UF2 (ubuntu-latest)	26s
Build Examples (stmicro/stm32)	18s
Unit Test Regz (macos-latest)	28s
Unit Test UF2 (windows-latest)	1m 41s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	15s
Build Examples (raspberrypi/rp2xxx)	2m 20s
Unit Test UF2 (macos-latest)	26s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 12s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 10s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 10s
Validate Foundation Libc (ubuntu-latest)	26s
Unit Test Ports (macos-latest, gigadevice/gd32)	26s
Validate Foundation Libc (windows-latest)	1m 19s
Validate Foundation Libc (macos-latest)	29s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	31s
Unit Test Ports (macos-latest, stmicro/stm32)	24s
	32m 54s

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