Option to treat 'Invalid file link' as error instead of warning

**Operating System**: `Windows`

**DocFX Version Used**: `2.58`

Sometimes I forget to precede a link to an API entity with `xref:` which leads to warnings like these:

```
[21-06-19 09:42:16.151]Warning:[BuildCommand.BuildCore.Build Document.LinkPhaseHandlerWithIncremental.ConceptualDocumentProcessor.Save](articles/playback/Data-tracking.md#L100)Invalid file link:(~/articles/playback/Melanchall.DryWetMidi.Devices.Playback.TrackControlValue).
[21-06-19 09:42:16.151]Warning:[BuildCommand.BuildCore.Build Document.LinkPhaseHandlerWithIncremental.ConceptualDocumentProcessor.Save](articles/playback/Custom-playback.md#L16)Invalid file link:(~/articles/playback/Melanchall.DryWetMidi.Devices.Playback.OutputDevice).
```

And the message from docfx says all is fine (almost):

```
Build succeeded with warning.
```

I build my docs within CI, so I want a build failed when `Invalid file link` error occured, because from my point of view it's absolutely an error, not a just warning. I must fix it before publishing the docs.

So my question: is it possible to tell docfx to treat such situations as errors and thus fail the build (I suppose docfx should return non-zero exit code)?

Thanks,
Max