umount before mounting /Media, use /caches rather than /tmp for vfs cache

hosts/hetzner-arm/containers/jellyfin/profiles/mediaMount.nix

@@ -8,16 +8,18 @@
     ${pkgs.rclone}/bin/rclone --config ${secrets.rclone_config.path} "$@"
   '';
   mountMedia = pkgs.writeShellScriptBin "mount-media" ''
+    umount -flR /Media || true
     ${rcloneMedia}/bin/rclone-media mount Media-Combine: /Media \
       --allow-other \
       --uid=${toString config.users.users.jellyfin.uid} \
       --gid=${toString config.users.groups.jellyfin.gid} \
       --fast-list \
       --umask=666 \
+      --cache-dir=/caches/media \
       --dir-cache-time=1m \
       --vfs-cache-mode=full \
-      --vfs-cache-max-age=120m \
       --vfs-cache-max-size=5g \
+      --vfs-cache-max-age=120m \
       --log-level=INFO "$@"
   '';
 in {
@@ -48,6 +50,9 @@ in {
   };
 
   systemd.tmpfiles.rules = [
+    "d /caches - root root"
+    "d /caches/media - jellyfin jellyfin"
+
     "d /Media - jellyfin jellyfin"
 
     "d /root/.config - root root"