Add run-in-minikube make target that resolves all deps

Only enabled on Darwin (a.k.a. macOS, a.k.a. OS X) because it's the only
platform that we have tested. Contributions for other platforms are
welcome.

We should uninstall VirtualBox, Minikube & kubectl and test that the
target works from a clean slate.

We are using VirtualBox as the VM driver for Minikube because
kubernetes/minikube#5951

Pair @michaelklishin

Author: gerhard

Diff for: Makefile

@@ -16,3 +16,37 @@ ERLANG_MK_COMMIT = rabbitmq-tmp
 
 include rabbitmq-components.mk
 include erlang.mk
+
+PLATFORM := $(shell uname)
+
+### Tested on OS X 10.14.6 & 10.15.1
+ifeq ($(PLATFORM),Darwin)
+
+### DEPS ###
+#
+VIRTUALBOX := /usr/local/bin/VBoxManage
+$(VIRTUALBOX):
+	@brew cask install virtualbox \
+	|| ( echo "Remember to read & follow the Caveats if installation fails" ; exit 1 )
+
+MINIKUBE := /usr/local/bin/minikube
+$(MINIKUBE): $(VIRTUALBOX)
+	@brew install minikube
+
+KUBECTL := /usr/local/bin/kubectl
+$(KUBECTL):
+	@brew install kubectl
+
+### TARGETS ###
+#
+.PHONY: minikube
+minikube: $(MINIKUBE)
+	@$(MINIKUBE) start --vm-driver=virtualbox
+
+.PHONY: run-in-minikube
+# run-in-minikube: minikube $(KUBECTL)
+run-in-minikube: $(KUBECTL)
+	@($(KUBECTL) get namespace test-rabbitmq || $(KUBECTL) create namespace test-rabbitmq) \
+	&& $(KUBECTL) apply -f examples/minikube
+
+endif