Add syntax directive to get started Dockerfile (#16299)

Co-authored-by: Sebastiaan van Stijn <thaJeztah@users.noreply.github.com>
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Craig Osterhout 2022-12-08 07:39:53 -08:00 committed by GitHub
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@ -77,6 +77,7 @@ In order to build the [container image](../get-started/overview.md/#docker-objec
2. Using a text editor or code editor, add the following contents to the Dockerfile:
```dockerfile
# syntax=docker/dockerfile:1
FROM node:18-alpine
WORKDIR /app
COPY . .