The Dockerfile create a wrong link

[jualy007]

When I try to running node with docker, I am try to mounting /data to my local /opt/polkadot/data path, but after running, there are no data in /opt/polkadot/data, the problem is that there are problems in Dockerfile.
In Dockerfile:
mkdir -p /root/.local/share/Polkadot &&
ln -s /root/.local/share/Polkadot /data

but when running polkdot, the data in store in /root/.local/share/polkadot.

[bkchr]

Fixed by: #332