Add OpenCV DNN pipeline #3037

Job	Run time
Build Examples	59s
photonclient-build	1m 0s
photon-build-all	44s
photonclient-check-lint	31s
Photonlib - Build Docker - Athena	1m 14s
Photonlib - Build Host - Win64	1m 37s
wpiformat	22s
Photonlib - Build Docker - Raspbian	1m 15s
photonserver-build-offline-docs	1m 16s
Photonlib - Build Docker - Aarch64	1m 29s
photonserver-check-lint	47s
Photonlib - Build Host - Linux	47s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
photon-release	0s
	12m 1s

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