Add OpenCV DNN pipeline #3122

Job	Run time
photon-build-all	5m 12s
Build Examples	3m 29s
photonclient-build	56s
photonserver-build-offline-docs	1m 32s
photonserver-check-lint	59s
photonclient-check-lint	30s
Photonlib - Build Docker - Athena	6m 21s
Photonlib - Build Host - Win64	8m 25s
wpiformat	24s
Photonlib - Build Docker - Raspbian	11m 29s
Photonlib - Build Host - Linux	5m 19s
Photonlib - Build Docker - Aarch64	10m 2s
Build fat JAR - Win64	3m 5s
Build fat JAR - macOS	2m 19s
Build fat JAR - Linux	1m 47s
Build fat JAR - macOSArm	2m 10s
Build fat JAR - LinuxArm32	2m 47s
Build fat JAR - LinuxArm64	1m 36s
Build image - ${{ matrix.image_url }}	0s
photon-release	0s
	1h 8m 22s

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