feat(ci): signal the pipeline that docs generation failed

Author: xperiandri

docs/loaders/apirefloader.fsx

@@ -108,8 +108,9 @@ let loader (projectRoot: string) (siteContet: SiteContents) =
             printfn $"Warning: Could not find {projectArtifactName} in any of the expected locations:"
             possiblePaths |> List.iter (printfn "  - %s")
             printfn "API documentation will not be generated."
+            Environment.Exit 1
     with
     | ex ->
         printfn "Error in API reference loader: %A" ex
-
+        Environment.Exit 1
     siteContet