Enable GHA on pre-chrobalt #15608

Job	Run time
raspi-2 / initialize	45s
raspi-2-skia / initialize	46s
raspi-2 / docker-build-image	30m 8s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	29m 8s
raspi-2-skia / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	12m 18s
raspi-2-skia / raspi-2-skia_debug	16m 5s
raspi-2-skia / raspi-2-skia_qa	10m 44s
raspi-2-skia / raspi-2-skia_gold	10m 28s
raspi-2 / ${{ matrix.name }}_${{ matrix.config }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	1h 50m 22s

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