K8s: Add App SDK installer (#107773)

apps/sdk.mk

@@ -0,0 +1,23 @@
+APP_SDK_VERSION = v0.40.0
+APP_SDK_DIR     = $(shell go env GOPATH)/bin/app-sdk-$(APP_SDK_VERSION)
+APP_SDK_BIN     = $(APP_SDK_DIR)/grafana-app-sdk
+
+
+.PHONY: install-app-sdk
+install-app-sdk: echodir $(APP_SDK_BIN) ## Install the Grafana App SDK
+
+.PHONY: echodir
+
+$(APP_SDK_BIN):
+	@echo "Installing Grafana App SDK version $(APP_SDK_VERSION)"
+	@mkdir -p $(APP_SDK_DIR)
+	# The only way to install specific versions of binaries using `go install`
+	# is by setting GOBIN to the directory you want to install the binary to.
+	GOBIN=$(APP_SDK_DIR) go install github.com/grafana/grafana-app-sdk/cmd/grafana-app-sdk@$(APP_SDK_VERSION)
+	@touch $@
+
+.PHONY: update-app-sdk
+update-app-sdk: ## Update the Grafana App SDK dependency in go.mod
+	@pwd
+	go get github.com/grafana/grafana-app-sdk@$(APP_SDK_VERSION)
+	go mod tidy || true # TODO: remove this