root@proxmox:~# cat /etc/systemd/system/acme-watcher.service
[Unit]
Description=Acme watcher
After=network.target

[Service]
Type=oneshot
ExecStart=/bin/systemctl reload nginx.service

[Install]
WantedBy=multi-user.target



root@proxmox:~# cat /etc/systemd/system/acme-watcher.path
[Path]
PathModified=/etc/pve/local/pveproxy-ssl.pem

[Install]
WantedBy=multi-user.target