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develop/scan-images: add syntax directives to dockerfile examples 

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2022-12-08 16:43:41 +01:00
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@ -100,6 +100,7 @@ A Docker image is built from a Dockerfile. A Dockerfile contains a set of instr
Building your image is a snapshot of that image, at that moment in time. When you depend on a base image without a tag, you’ll get a different base image every time you rebuild. Also, when you install packages using a package installer, rebuilding can change the image drastically. For example, a Dockerfile containing the following entries can potentially have a different binary with every rebuild.
```dockerfile
# syntax=docker/dockerfile:1
FROM ubuntu:latest
RUN apt-get -y update && apt-get install -y python
```