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Add yaml linter check #256

Job	Run time
Zephyr devcontainer / Necessary?	1s
Linux devcontainer / Necessary?	1s
Linux devcontainer / Build and push	1s
Zephyr devcontainer / Build and push	1s
Linux	0s
Zephyr System Tests	0s
Zephyr	0s
Formatting checks	0s
	4s

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