Refactor Makefiles

[kvaps]

As part of #76

Let's create common Makefile ./hack/package-system.mk with the folowing content:

.DEFAULT_GOAL=help
.PHONY=help show diff apply delete update image

help: ## Show this help.
	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {sub("\\\\n",sprintf("\n%22c"," "), $$2);printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)

show: ## Show output of rendered templates
	helm template --dry-run=server -n $(NAMESPACE) $(NAME) .

apply: suspend ## Apply Helm release to a Kubernetes cluster 
	helm upgrade -i -n $(NAMESPACE) $(NAME) .

diff: ## Diff Helm release against objects in a Kubernetes cluster
	helm diff upgrade --allow-unreleased --normalize-manifests -n $(NAMESPACE) $(NAME) .

suspend: ## Suspend reconciliation for an existing Helm release
	flux suspend hr -n $(NAMESPACE) $(NAME)

resume: ## Resume reconciliation for an existing Helm release
	flux resume hr -n $(NAMESPACE) $(NAME)

And include it in every packages/system/* package:

include ../../hack/package-system.mk