FROM node:12-alpine does not work

Change to FROM node:alpine works

docs/tutorial/our-application/index.md

@@ -37,7 +37,7 @@ see a few flaws in the Dockerfile below. But, don't worry! We'll go over them.
 1. Create a file named `Dockerfile` in the same folder as the file `package.json` with the following contents.
 
     ```dockerfile
-    FROM node:12-alpine
+    FROM node:alpine
     RUN apk add --no-cache python g++ make
     WORKDIR /app
     COPY . .