Add OpenCV DNN pipeline #3123

Job	Run time
photon-build-all	5m 19s
photonclient-build	1m 1s
photonclient-check-lint	27s
Build Examples	3m 34s
Photonlib - Build Docker - Athena	4m 41s
Photonlib - Build Host - Win64	8m 34s
Photonlib - Build Docker - Raspbian	11m 21s
wpiformat	20s
Photonlib - Build Host - Linux	5m 10s
photonserver-build-offline-docs	1m 23s
Photonlib - Build Docker - Aarch64	11m 50s
photonserver-check-lint	48s
Build fat JAR - Win64	3m 19s
Build fat JAR - macOS	3m 8s
Build fat JAR - Linux	2m 26s
Build fat JAR - macOSArm	2m 59s
Build fat JAR - LinuxArm32	2m 30s
Build fat JAR - LinuxArm64	1m 56s
Build image - ${{ matrix.image_url }}	0s
photon-release	0s
	1h 10m 46s

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