Recreate nuget.config with a proper feed for macos (#5793)

images/macos/provision/core/xamarin.sh

@@ -82,4 +82,8 @@ PREFERENCES_XAMARIN_DIR="${HOME}/Library/Preferences/Xamarin"
 mkdir -p $PREFERENCES_XAMARIN_DIR
 /usr/libexec/PlistBuddy -c "add :AppleSdkRoot string /Applications/Xcode_${DEFAULT_XCODE_VERSION}.app" $PREFERENCES_XAMARIN_DIR/Settings.plist
 
+# Temporary workaround to recreate nuget.config file with a correct feed https://github.com/actions/virtual-environments/issues/5768
+rm -rf $HOME/.config/NuGet/NuGet.Config
+nuget config
+
 invoke_tests "Xamarin"

images/macos/tests/Xamarin.Tests.ps1

@@ -291,3 +291,9 @@ Describe "Xamarin Bundles" {
         Validate-IdenticalFileContent -File1 $targetVersionPath -File2 $sourceVersionPath
     }
 }
+
+Describe "Nuget" {
+    It "Nuget config contains nuget.org feed" {
+        Get-Content $env:HOME/.config/NuGet/NuGet.Config | Out-String | Should -Match "nuget.org"
+    }
+}