add make dist target

Author: databus23

.gitignore

@@ -1,2 +1,4 @@
 diff
 vendor/
+release/
+.envrc

Makefile

@@ -20,3 +20,18 @@ ifndef HAS_GLIDE
 	go get -u github.com/Masterminds/glide
 endif
 	glide install --strip-vendor
+
+.PHONY: dist
+dist:
+	GOOS=linux GOARCH=amd64 go build -o diff -ldflags="$(LDFLAGS)"
+	tar -zcvf release/helm-template-linux.tgz diff README.md LICENSE plugin.yaml
+	GOOS=darwin GOARCH=amd64 go build -o diff -ldflags="$(LDFLAGS)"
+	tar -zcvf release/helm-template-macos.tgz diff README.md LICENSE plugin.yaml
+	rm diff
+
+.PHONY: release
+release: dist
+ifndef GITHUB_ACCESS_TOKEN
+	$(error GITHUB_ACCESS_TOKEN is undefined)
+endif
+	gh-release create databus23/helm-diff $(VERSION) master