fix: set docs workflow inputPath for monorepo template location (#408)

The microsoft/ps-docs action defaults to scanning from the workspace
root. After the monorepo restructure, templates moved from templates/
to packages/psdocs-azure/templates/, and the scanner was picking up
invalid template.json files from subtree imports causing:

  Cannot process argument because the value of argument "name" is
  not valid.

Set inputPath to packages/psdocs-azure/templates to restrict scanning
to only the valid ARM templates.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: vicperdana

.github/workflows/docs.yaml

@@ -35,6 +35,7 @@ jobs:
         uses: microsoft/ps-docs@main
         with:
           modules: PSDocs,PSDocs.Azure
+          inputPath: packages/psdocs-azure/templates
           outputPath: docs/templates/
           prerelease: true