feat: add more targets to makefile (ex: install)

Makefile

@@ -1,6 +1,37 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# SPDX-FileCopyrightText: 2023 Glenn Y. Rolland <glenux@glenux.net>
+# Copyright © 2023 Glenn Y. Rolland <glenux@glenux.net>
+
+CURRENT_UID := $(shell id -u)
+CURRENT_GID := $(shell id -g)
+ifeq ($(CURRENT_UID),0)
+PREFIX=/usr
+else
+PREFIX=$(HOME)/.local
+endif
 
 
 all: build
 
+prepare:
+		shards install
+
 build:
-	shards build --error-trace
+		shards build --error-trace -Dpreview_mt
+		@echo SUCCESS
+
+watch: 
+		 watchexec --restart --delay-run 3 -c -e cr make build
+
+spec: test
+test:
+		crystal spec --error-trace
+
+install:
+		install \
+				-m 755 \
+				bin/docmachine \
+				$(PREFIX)/bin
+
+.PHONY: spec test build all prepare install