Add make targets to generate release Kubernetes manifests (#613)

## Description
This PR adds Makefile target `release` to generate Kubernetes manifests for `tink-server` and `tink-controller`

## Why is this needed
This is needed to generate the release manifests using `kustomize`

## How Has This Been Tested?
Ran `make release` and verified that the manifest gets generated properly 

## How are existing users impacted? What migration steps/scripts do we need?
No user impact

## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

kube.mk

@@ -1,3 +1,31 @@
+# Directories
+TOOLS_DIR := hack/tools
+TOOLS_BIN_DIR := $(abspath $(TOOLS_DIR)/bin)
+GO_INSTALL = ./scripts/go_install.sh
+
+# Binaries
+CONTROLLER_GEN_VER := v0.8.0
+CONTROLLER_GEN_BIN := controller-gen
+CONTROLLER_GEN := $(TOOLS_BIN_DIR)/$(CONTROLLER_GEN_BIN)
+
+KUSTOMIZE_VER := v4.5.4
+KUSTOMIZE_BIN := kustomize
+KUSTOMIZE := $(TOOLS_BIN_DIR)/$(KUSTOMIZE_BIN)
+
+## --------------------------------------
+## Tooling Binaries
+## --------------------------------------
+
+$(CONTROLLER_GEN): ## Build controller-gen from tools folder.
+	GOBIN=$(TOOLS_BIN_DIR) go install sigs.k8s.io/controller-tools/cmd/controller-gen@$(CONTROLLER_GEN_VER)
+
+$(KUSTOMIZE): ## Build kustomize from tools folder.
+	GOBIN=$(TOOLS_BIN_DIR) go install sigs.k8s.io/kustomize/kustomize/v4@$(KUSTOMIZE_VER)
+
+## --------------------------------------
+## Generate
+## --------------------------------------
+
 PHONY: generate
 generate: generate-go generate-manifests # Generate code, manifests etc.
 
@@ -24,3 +52,42 @@ generate-manifests: bin/controller-gen # Generate manifests e.g. CRD, RBAC etc.
 		output:rbac:dir=./config/server-rbac \
 		rbac:roleName=server-role
 	prettier --write ./config/
+
+## --------------------------------------
+## Generate
+## --------------------------------------
+
+RELEASE_DIR ?= out/release
+
+$(RELEASE_DIR):
+	mkdir -p $(RELEASE_DIR)/
+
+REGISTRY ?= quay.io/tinkerbell
+TINK_SERVER_IMAGE_NAME ?= tink-server
+TINK_CONTROLLER_IMAGE_NAME ?= tink-controller
+TINK_SERVER_IMAGE_TAG ?= latest
+TINK_CONTROLLER_IMAGE_TAG ?= latest
+
+.PHONY: set-manager-manifest-image
+set-manager-manifest-image:
+	$(info Updating kustomize image patch file for tink-controller)
+	sed -i'' -e 's@image: .*@image: '"${MANIFEST_IMG}:$(MANIFEST_TAG)"'@' ./config/default/manager_image_patch.yaml
+
+.PHONY: set-server-manifest-image
+set-server-manifest-image:
+	$(info Updating kustomize image patch file for tink-server)
+	sed -i'' -e 's@image: .*@image: '"${MANIFEST_IMG}:$(MANIFEST_TAG)"'@' ./config/default/server_image_patch.yaml
+
+.PHONY: release
+release: clean-release
+	$(MAKE) set-manager-manifest-image MANIFEST_IMG=$(REGISTRY)/$(TINK_SERVER_IMAGE_NAME) MANIFEST_TAG=$(TINK_CONTROLLER_IMAGE_TAG)
+	$(MAKE) set-server-manifest-image MANIFEST_IMG=$(REGISTRY)/$(TINK_SERVER_IMAGE_NAME) MANIFEST_TAG=$(TINK_SERVER_IMAGE_TAG)
+	$(MAKE) release-manifests
+
+.PHONY: release-manifests ## Builds the manifests to publish with a release.
+release-manifests: $(KUSTOMIZE) $(RELEASE_DIR)
+	$(KUSTOMIZE) build config/default > $(RELEASE_DIR)/tink.yaml
+
+.PHONY: clean-release
+clean-release: ## Remove the release folder
+	rm -rf $(RELEASE_DIR)