Powershell isn't smart enough to get only the last line of output of vcpkg fetch nuget, so run it an extra time so we don't get failures if vcpkg has to download it.

Author: jackjansen

.github/workflows/build-test.yml

@@ -446,6 +446,7 @@ jobs:
     - name: Add NuGet sources for vcpkg
       shell: pwsh
       run: |
+        ${{ env.VCPKG_EXE }} fetch nuget
         .$(${{ env.VCPKG_EXE }} fetch nuget) `
           sources add `
           -Source "${{ env.FEED_URL }}" `