separate into 3. #84

Job	Run time
deploy-nhs-notify-feature	13s
build-and-push-image (default, nhsdigital/nhs-notify-devcontainer-default, NHS Notifiy Devcontain...	51s
build-and-push-image (base, nhsdigital/nhs-notify-devcontainer-base, NHS Notifiy Devcontainer Bas...	59s
build-and-push-image (loaded, nhsdigital/nhs-notify-devcontainer-loaded, NHS Notifiy Devcontainer...	51s
	2m 54s

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