Fix for Remove NuGet Source steps (now with enhanced logging) (#3263)

* Update template-restore-build-MSIdentityWeb.yaml

* Update template-restore-build-MSIdentityWeb.yaml

Author: gladjohn

build/template-restore-build-MSIdentityWeb.yaml

@@ -9,12 +9,58 @@ parameters:
 steps:
 - powershell: |
     Push-Location $(IdWebSourceDir)
-    $nugetSourceIsExternal = (dotnet nuget list source --format Short).Contains("https://api.nuget.org/v3/index.json")
+
+    # Check if nuget.config exists
+    $nugetConfigPath = "$(IdWebSourceDir)\nuget.config"
+    if (Test-Path $nugetConfigPath) {
+        Write-Host "Found nuget.config at $nugetConfigPath"
+    } else {
+        Write-Host "Warning: nuget.config file not found at expected path."
+        $nugetConfigPath = ""  # Use default global config
+    }
+
+    Write-Host "Listing existing NuGet sources..."
+    dotnet nuget list source
+
+    Write-Host "Checking if the external NuGet source exists..."
+    $nugetSources = dotnet nuget list source --format Short
+    $nugetSourceIsExternal = $nugetSources -match "https://api.nuget.org/v3/index.json"
+
     if ($nugetSourceIsExternal) {
-        dotnet nuget remove source NuGet
+        Write-Host "Removing external NuGet source..."
+        if ($nugetConfigPath -ne "") {
+            dotnet nuget remove source NuGet --configfile $nugetConfigPath
+        } else {
+            dotnet nuget remove source NuGet
+        }
+
+        if ($?) { 
+            Write-Host "Successfully removed external NuGet source." 
+        } else { 
+            Write-Host "Failed to remove external NuGet source." 
+            exit 1
+        }
+    } else {
+        Write-Host "External NuGet source not found. Skipping removal."
+    }
+
+    Write-Host "Adding IDDP NuGet source..."
+    if ($nugetConfigPath -ne "") {
+        dotnet nuget add source https://identitydivision.pkgs.visualstudio.com/_packaging/IDDP/nuget/v3/index.json -n IDDP --configfile $nugetConfigPath
+    } else {
         dotnet nuget add source https://identitydivision.pkgs.visualstudio.com/_packaging/IDDP/nuget/v3/index.json -n IDDP
-        dotnet nuget list source
     }
+
+    if ($?) { 
+        Write-Host "Successfully added IDDP NuGet source." 
+    } else { 
+        Write-Host "Failed to add IDDP NuGet source." 
+        exit 1
+    }
+
+    Write-Host "Final NuGet sources list:"
+    dotnet nuget list source
+
     Pop-Location
   displayName: 'Remove external "NuGet" Source and add "IDDP artifacts" as a NuGet Source, if needed.'