Fix some cases with e2e targets

The e2e targets were not setup correctly preventing some variables from
being set.

Makefile.e2e

@@ -0,0 +1,47 @@
+.PHONY: skaffold.validate
+skaffold.validate: kubectl_context := $(shell kubectl config current-context)
+skaffold.validate:
+	if [[ ! "minikube,docker-for-desktop,docker-desktop" =~ .*"$(kubectl_context)".* ]]; then \
+		echo current-context is [$(kubectl_context)]. Must be one of [minikube,docker-for-desktop,docker-desktop]; \
+		false; \
+	fi
+
+# skaffold deploys the virtual-kubelet to the Kubernetes cluster targeted by the current kubeconfig using skaffold.
+# The current context (as indicated by "kubectl config current-context") must be one of "minikube" or "docker-for-desktop".
+# MODE must be set to one of "dev" (default), "delete" or "run", and is used as the skaffold command to be run.
+.PHONY: skaffold
+skaffold: MODE ?= dev
+skaffold: skaffold/$(MODE)
+
+.PHONY: skaffold/%
+skaffold/%: PROFILE := local
+skaffold/%: skaffold.validate
+	skaffold $(*) \
+		-f $(PWD)/hack/skaffold/virtual-kubelet/skaffold.yml \
+		-p $(PROFILE)
+
+# e2e runs the end-to-end test suite against the Kubernetes cluster targeted by the current kubeconfig.
+# It automatically deploys the virtual-kubelet with the mock provider by running "make skaffold MODE=run".
+# It is the caller's responsibility to cleanup the deployment after running this target (e.g. by running "make skaffold MODE=delete").
+.PHONY: e2e
+e2e: KUBECONFIG ?= $(HOME)/.kube/config
+e2e: NAMESPACE := default
+e2e: NODE_NAME := vkubelet-mock-0
+e2e: TAINT_KEY := virtual-kubelet.io/provider
+e2e: TAINT_VALUE := mock
+e2e: TAINT_EFFECT := NoSchedule
+e2e: tags_with_mock := $(VK_BUILD_TAGS) mock
+e2e: e2e.clean
+	GOOS=linux GOARCH=amd64 $(MAKE) VK_BUILD_TAGS="$(tags_with_mock)" build; \
+	$(MAKE) skaffold/run; \
+	cd $(PWD)/test/e2e && go test -v -tags e2e ./... \
+		-kubeconfig=$(KUBECONFIG) \
+		-namespace=$(NAMESPACE) \
+		-node-name=$(NODE_NAME) \
+		-taint-key=$(TAINT_KEY) \
+		-taint-value=$(TAINT_VALUE) \
+		-taint-effect=$(TAINT_EFFECT)
+
+.PHONY: e2e.clean
+e2e.clean: #skaffold/delete
+	kubectl delete --ignore-not-found node $(NODE_NAME)