added hook script

hooks/update.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -e
+echo "[webhook] Pulling new code..."
+
+cd /virt/nexus-timer || exit 1
+git pull origin main
+
+echo "[webhook] Building image..."
+docker build -t virt-nexus-timer .
+
+echo "[webhook] Restarting systemd service..."
+systemctl restart virt-nexus-timer.service
+
+echo "[webhook] Done."