Add missing Makefile

GNUmakefile

@@ -0,0 +1,34 @@
+NAME=xenserver
+BINARY=packer-plugin-${NAME}
+
+COUNT?=1
+TEST?=$(shell go list ./...)
+HASHICORP_PACKER_PLUGIN_SDK_VERSION?=$(shell go list -m github.com/hashicorp/packer-plugin-sdk | cut -d " " -f2)
+
+.PHONY: dev
+
+build:
+	@go build -o ${BINARY}
+
+dev: build
+	@mkdir -p ~/.packer.d/plugins/
+	@mv ${BINARY} ~/.packer.d/plugins/${BINARY}
+
+test:
+	@go test -race -count $(COUNT) $(TEST) -timeout=3m
+
+install-packer-sdc: ## Install packer sofware development command
+	@go install github.com/hashicorp/packer-plugin-sdk/cmd/packer-sdc@${HASHICORP_PACKER_PLUGIN_SDK_VERSION}
+
+ci-release-docs: install-packer-sdc
+	@packer-sdc renderdocs -src docs -partials docs-partials/ -dst docs/
+	@/bin/sh -c "[ -d docs ] && zip -r docs.zip docs/"
+
+plugin-check: install-packer-sdc build
+	@packer-sdc plugin-check ${BINARY}
+
+testacc: dev
+	@PACKER_ACC=1 go test -count $(COUNT) -v $(TEST) -timeout=120m
+
+generate: install-packer-sdc
+	@go generate ./...