feat: auto-login to tailscale in devcontainer (#96)

scripts/setup-tailscale.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+# Tailscale setup script
+# Authenticates with Tailscale if TS_AUTH_KEY is set and Tailscale is not already logged in
+
+set -e
+
+if [ -z "$TS_AUTH_KEY" ]; then
+    echo "TS_AUTH_KEY is not set, skipping Tailscale login."
+    exit 0
+fi
+
+STATUS=$(tailscale status 2>&1 || true)
+
+if echo "$STATUS" | grep -qi "logged out\|stopped"; then
+    echo "Tailscale is not authenticated. Logging in..."
+    sudo tailscale up --accept-routes --auth-key="$TS_AUTH_KEY"
+    echo "Tailscale login complete."
+else
+    echo "Tailscale is already authenticated, skipping."
+fi