add checkoutstep. #117

Job	Run time
deploy-nhs-notify-feature	12s
check-if-changed	5s
build-and-push-image (default, NHS Notifiy Devcontainer Default Image, Default development contai...	47s
build-and-push-image (base, NHS Notifiy Devcontainer Base Image, Base development container for N...	40s
build-and-push-image (loaded, NHS Notifiy Devcontainer Loaded Image, Loaded development container...	47s
	2m 31s

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