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[main] Update common Docker engineering infrastructure with latest #1310

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22 changes: 22 additions & 0 deletions eng/docker-tools/DEV-GUIDE.md
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Expand Up @@ -198,6 +198,28 @@ The stages variable is useful for:
- Skipping tests during initial development
- Running isolated stages for debugging

### Decoupling build OS from the base image OS

By default, a platform's `osVersion` represents the base image OS version, but also determines what
build leg an image is built in. This can cause problems when build image and base image don't match
up. For example, building a .NET app on Windows Server 2025 and copying the artifacts into a
Windows Server 2019 base image won't work, because the build matrix generation will attempt to
build the image on the Server 2019 build leg (which can't run Server 2025 images).

To fix this, set the optional `buildOsVersion` field in order to override only the OS used in the
build matrix generation. Here is an example of building a Windows Server 2019 image using Windows
Server 2025:

```jsonc
{
// ...
"os": "windows",
"osVersion": "windowsservercore-ltsc2019",
"buildOsVersion": "windowsservercore-ltsc2025"
// ...
}
```

### Image Info Files: The Build's Memory

Image info files (defined by [`ImageArtifactDetails`](https://github.com/dotnet/docker-tools/blob/main/src/ImageBuilder/Models/Image/ImageArtifactDetails.cs)) are the mechanism that tracks what was built:
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