diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ce75144
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+default:
+
+build:
+	docker run --rm -i \
+		-v "$(CURDIR):$(CURDIR)" \
+		-w "$(CURDIR)" \
+		node:10-alpine \
+		sh -exc "npm ci && npm run build && rm -rf node_modules && chown $(shell id -u):$(shell id -g) app.js"
diff --git a/README.md b/README.md
index 2152cbd..117f3af 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ You can define:
 - Create a `config.js` from the `config.sample.js`
 - Get yourself a configured [clasp](https://github.com/google/clasp)
 - Create a Google Apps-Script project and activate the Gmail API in the corresponding GCP Project
-- Execute `npm ci && npm run build` to generate the App-Script version of the code
+- Execute `make build` to generate the App-Script version of the code
 - Execute a `clasp push` to upload the source code into your project
 
 If everything went well you now should have your `config.js` and an `app.js` inside your App-Script project. (In the web-UI they are called `.gs` files instead of `.js`.)