Add WebDAV mount instructions to Seafile page

Seafile.md

@@ -49,6 +49,36 @@ sudo mount -t davfs https://docs.alogins.net/seafdav/ /mnt/seafile -o uid=1000,g
 
 **Note:** add `127.0.0.1 docs.alogins.net` to `/etc/hosts` — the public IP is unreachable from the host itself (hairpin NAT).
 
+### Permanent mount (fstab)
+
+Install davfs2 and allow non-root mounts:
+```bash
+sudo apt install davfs2
+sudo usermod -aG davfs2 alvis
+```
+
+Store credentials in `/etc/davfs2/secrets`:
+```
+https://docs.alogins.net/seafdav/ allogn@gmail.com <password>
+```
+
+Add to `/etc/fstab`:
+```
+https://docs.alogins.net/seafdav/ /mnt/seafile davfs uid=1000,gid=1000,_netdev 0 0
+```
+
+Mount:
+```bash
+sudo mkdir -p /mnt/seafile
+sudo mount /mnt/seafile
+```
+
+### Manual mount
+```bash
+sudo mount -t davfs https://docs.alogins.net/seafdav/ /mnt/seafile -o uid=1000,gid=1000
+sudo umount /mnt/seafile
+```
+
 Enabled in `seafdav.conf` (inside container at `/shared/seafile/conf/`):
 ```ini
 [WEBDAV]