perf improvements. #138

Job	Run time
deploy-nhs-notify-feature	5s
check-if-changed	3s
build-and-push-image (default, NHS Notifiy Devcontainer Default Image, Default development contai...	8m 32s
build-and-push-image (loaded, NHS Notifiy Devcontainer Loaded Image, Loaded development container...	1m 25s
build-and-push-image (loaded-codespaces, NHS Notifiy Devcontainer Loaded Image, Loaded developmen...	1m 56s
build-and-push-image (base, NHS Notifiy Devcontainer Base Image, Base development container for N...	3m 3s
	15m 4s

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