chore: add prepare & test target to Makefile

Makefile

@@ -9,6 +9,9 @@ all: build
 %.mjml.html: %.mjml
 	npx mjml $< --config.minify > $@
 
+.PHONY: prepare
+prepare: 
+	go mod download
 
 .PHONY: build build-binaries build-templates
 build: build-binaries build-templates  ## build executable
@@ -38,8 +41,10 @@ clean-templates:
 clean-binaries:
 	rm -rf ./_build/*
 
-test: build 
-	./test.sh
+.PHONY: test
+test: # build 
+	go test ./...
+	# ./test.sh
 
 npm: 
 	npm install