pct exec runs as root while /opt/linkvault is owned by the linkvault
user, so newer git versions refuse to operate on it. Mark the
directory as safe before running git pull.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Adds scripts/proxmox/update-linkvault.sh to pull the latest git
changes, refresh dependencies, and restart the systemd service on an
existing container. Documents usage in the README.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>