Add prompt to confirm correct cluster but doesn't prompt when CI=true (GH actions)

Makefile

delete-namespace: check-cluster
  kubectl delete namespace sandbox

check-cluster:
	@if [ -z "$(CI)" ]; then current_context=$(shell kubectl config current-context); \
		echo "The current context is `tput bold`$$current_context`tput sgr0`."; \
		read -p "Is this the correct context? (y/n): " answer; if [ "$$answer" != "y" ]; \
		then echo "Aborted."; exit 1; fi; echo "Proceeding..."; \
	fi

# $ make delete-namespace
# The current context is docker-desktop.
# Is this the correct context? (y/n): y
# Proceeding...