Add copilot-setup.sh to install .NET 10 RC1 SDK

Co-authored-by: stephentoub <[email protected]>

Author: Copilot

.github/copilot-setup.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+set -e
+
+echo "=== Copilot Setup: .NET SDK Installation ==="
+
+# Parse the SDK version from global.json
+GLOBAL_JSON_PATH="${GITHUB_WORKSPACE:-$(pwd)}/global.json"
+
+if [ ! -f "$GLOBAL_JSON_PATH" ]; then
+    echo "Error: global.json not found at $GLOBAL_JSON_PATH"
+    exit 1
+fi
+
+echo "Reading SDK version from global.json..."
+SDK_VERSION=$(grep -A 3 '"sdk"' "$GLOBAL_JSON_PATH" | grep '"version"' | sed 's/.*"version"[^"]*"\([^"]*\)".*/\1/')
+
+if [ -z "$SDK_VERSION" ]; then
+    echo "Error: Could not parse SDK version from global.json"
+    exit 1
+fi
+
+echo "Required SDK version: $SDK_VERSION"
+
+# Check if the SDK is already installed
+if dotnet --list-sdks | grep -q "$SDK_VERSION"; then
+    echo "✓ .NET SDK $SDK_VERSION is already installed"
+else
+    echo "Installing .NET SDK $SDK_VERSION..."
+    
+    # Download and install the .NET SDK
+    # Using the dotnet-install script from Microsoft
+    curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --version "$SDK_VERSION" --install-dir /usr/share/dotnet
+    
+    echo "✓ .NET SDK $SDK_VERSION installed successfully"
+fi
+
+# Display installed SDK information
+echo ""
+echo "=== Installed .NET SDKs ==="
+dotnet --list-sdks
+
+echo ""
+echo "=== Current .NET SDK Version ==="
+dotnet --version
+
+echo ""
+echo "=== .NET Info ==="
+dotnet --info
+
+echo ""
+echo "=== Copilot Setup Complete ==="