Add gpg agent to zsh plugins. #134

Job	Run time
deploy-nhs-notify-feature	0s
check-if-changed	6s
build-and-push-image (base, NHS Notifiy Devcontainer Base Image, Base development container for N...	4m 14s
build-and-push-image (default, NHS Notifiy Devcontainer Default Image, Default development contai...	9m 43s
build-and-push-image (loaded, NHS Notifiy Devcontainer Loaded Image, Loaded development container...	2m 2s
	16m 5s

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