Fix devcontainer to properly restore projects with private NuGet feed using interactive authentication

.devcontainer/devcontainer.json

@@ -2,8 +2,17 @@
   "image": "mcr.microsoft.com/devcontainers/dotnet",
   "features": {
     "ghcr.io/devcontainers/features/dotnet:2": {
-      "version": "latest"
+      "version": "9.0"
     }
   },
-  "postCreateCommand": "dotnet --list-sdks"
+  "postCreateCommand": ".devcontainer/setup-nuget-auth.sh",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-dotnettools.csharp",
+        "ms-dotnettools.csdevkit"
+      ]
+    }
+  },
+  "remoteUser": "vscode"
 }

.devcontainer/setup-nuget-auth.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+set -e
+
+echo "Setting up NuGet authentication for Azure DevOps..."
+
+# Install Azure Artifacts Credential Provider
+echo "Installing Azure Artifacts Credential Provider..."
+if sh -c "$(curl -fsSL https://aka.ms/install-artifacts-credprovider.sh)" 2>/dev/null; then
+    echo "✅ Azure Artifacts Credential Provider installed successfully"
+else
+    echo "⚠️  Could not download Azure Artifacts Credential Provider installer."
+    echo "This may be due to network restrictions. Falling back to public packages only."
+    export ACCESS_TO_NUGET_FEED=false
+fi
+
+# Display .NET version
+echo "Checking .NET SDK version..."
+dotnet --version
+
+# Try to restore packages with interactive authentication if credential provider is available
+echo "Attempting to restore NuGet packages..."
+if command -v dotnet-credential-provider-installer >/dev/null 2>&1 || [ -n "$(find ~/.nuget -name "*CredentialProvider*" 2>/dev/null | head -1)" ]; then
+    echo ""
+    echo "🔐 The credential provider is available for Azure DevOps authentication."
+    echo "If prompted for credentials during package restoration, you can:"
+    echo "  1. Use your Azure DevOps account credentials, or"
+    echo "  2. Create a Personal Access Token (PAT) with 'Packaging (read)' permissions"
+    echo "     from: https://dev.azure.com/intelliTect/_usersSettings/tokens"
+    echo ""
+
+    # First try to restore with interactive authentication for private packages
+    if dotnet restore --interactive -p:AccessToNugetFeed=true; then
+        echo "✅ Package restoration successful with private feed access!"
+    else
+        echo "⚠️  Private package restoration failed or was cancelled."
+        echo "Falling back to public packages only..."
+        if dotnet restore -p:AccessToNugetFeed=false; then
+            echo "✅ Package restoration successful with public packages only!"
+        else
+            echo "❌ Package restoration failed completely."
+            exit 1
+        fi
+    fi
+else
+    echo "Credential provider not available, using public packages only..."
+    if dotnet restore -p:AccessToNugetFeed=false; then
+        echo "✅ Package restoration successful with public packages only!"
+    else
+        echo "❌ Package restoration failed."
+        exit 1
+    fi
+fi
+
+echo "🎉 Devcontainer setup complete!"

.gitignore

@@ -277,6 +277,9 @@ FodyWeavers.xsd
 # JetBrains Rider
 *.sln.iml
 
-EssentialCSharp.Web/Markdown/
-
-EssentialCSharp.Web/Guidelines/
+EssentialCSharp.Web/Markdown/
+
+EssentialCSharp.Web/Guidelines/
+
+# DevContainer environment files with sensitive data
+.devcontainer/.env