fix: ensure seafile runs before issuing rpc commands

docker-entrypoint.sh

@@ -7,6 +7,10 @@ mkdir -p ~/seafile
 seaf-cli init -d ~/seafile
 seaf-cli start
 
+until [ -S ~/seafile/seafile-data/seafile.sock ]; do
+  sleep 1;
+done
+
 if [ -z "$OTP_TOKEN" ]; then
   echo "syncing library"
   seaf-cli "$TASK" -l "$LIBRARY" -s "$SERVER" -d "/sync" -u "$EMAIL" -p "$PASSWORD"