chore: add .NET SDK 10 setup script for Ubuntu 24.04

https://claude.ai/code/session_01TkefnuBXDCo2m7GrgASYZA

Author: claude

setup-dotnet.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -euo pipefail
+
+# Install .NET SDK 10 on Ubuntu 24.04 (Noble) x86_64
+# Uses the official Microsoft package feed
+
+echo "==> Adding Microsoft package signing key and repo..."
+apt-get update -qq
+apt-get install -y --no-install-recommends wget ca-certificates
+
+wget -q https://packages.microsoft.com/config/ubuntu/24.04/packages-microsoft-prod.deb -O /tmp/packages-microsoft-prod.deb
+dpkg -i /tmp/packages-microsoft-prod.deb
+rm /tmp/packages-microsoft-prod.deb
+
+echo "==> Installing .NET SDK 10..."
+apt-get update -qq
+apt-get install -y --no-install-recommends dotnet-sdk-10.0
+
+echo "==> Verifying installation..."
+dotnet --version
+
+echo "==> Done."