Add dependencies for Apple silicon / M1 / arm64 builds

Signed-off-by: Stefan Scherer <stefan.scherer@docker.com>

docs/tutorial/our-application/index.md

@@ -38,6 +38,8 @@ see a few flaws in the Dockerfile below. But, don't worry! We'll go over them.
 
     ```dockerfile
     FROM node:12-alpine
+    # Adding build tools to make yarn install work on Apple silicon / arm64 machines
+    RUN apk add --no-cache python3 g++ make
     WORKDIR /app
     COPY . .
     RUN yarn install --production