Add workflow to auto label PRs #1676

Job	Run time
raspi-2 / initialize	2m 49s
raspi-2-skia / initialize	35s
raspi-2-skia / docker-build-image	21m 16s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	21m 37s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	8m 2s
raspi-2-skia / raspi-2-skia_debug	8m 41s
raspi-2-skia / raspi-2-skia_qa	7m 45s
raspi-2-skia / raspi-2-skia_gold	7m 30s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / on-host-unit-test-report	0s
raspi-2 / raspi_devel	9m 52s
raspi-2 / raspi_debug	9m 0s
raspi-2 / raspi_qa	7m 5s
raspi-2 / raspi_gold	7m 12s
raspi-2 / sbversion-13_devel	10m 23s
raspi-2 / sbversion-13_debug	8m 41s
raspi-2 / sbversion-13_qa	7m 17s
raspi-2 / sbversion-13_gold	7m 2s
raspi-2 / sbversion-14_devel	10m 25s
raspi-2 / sbversion-14_debug	8m 39s
raspi-2 / sbversion-14_qa	7m 7s
raspi-2 / sbversion-14_gold	6m 59s
raspi-2 / sbversion-15_devel	9m 48s
raspi-2 / sbversion-15_debug	8m 44s
raspi-2 / sbversion-15_qa	7m 34s
raspi-2 / sbversion-15_gold	7m 29s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / on-host-unit-test-report	0s
	3h 31m 32s

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