Add gpg agent to zsh plugins. #133

Job	Run time
deploy-nhs-notify-feature	8s
check-if-changed	3s
build-and-push-image (default, NHS Notifiy Devcontainer Default Image, Default development contai...	7m 20s
build-and-push-image (base, NHS Notifiy Devcontainer Base Image, Base development container for N...	2m 43s
build-and-push-image (loaded, NHS Notifiy Devcontainer Loaded Image, Loaded development container...	2m 15s
	12m 29s

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