Add Github Action check to make sure template UI is unchanged #2973

Job	Run time
photonclient-check-lint	28s
Build Examples	1m 28s
photonclient-build	1m 9s
photon-build-all	1m 8s
photonserver-build-offline-docs	54s
Photonlib - Build Docker - Athena	52s
Photonlib - Build Host - Win64	48s
Photonlib - Build Docker - Raspbian	45s
photonserver-check-lint	46s
wpiformat	24s
Photonlib - Build Host - Linux	59s
Photonlib - Build Docker - Aarch64	51s
Build fat JAR - ${{ matrix.artifact-name }}	1s
Build image - ${{ matrix.image_url }}	1s
photon-release	1s
	10m 35s

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