Allow data dir to be a symlink

[matevz]

SUMMARY

I ran out of disk space the other day and migrated datadir to the new drive. Instead of setting a new path in the oasis node config file I replaced the original data dir folder with a symbolic link pointing to a folder on the new drive. But when running oasis-node, I get

common/Mkdir: path '/home/matevz/.oasis-node/data_validator' is not a directory

This approach usually works for other services (tested with bitcoind, geth, clightning), so I would prefer to use it for oasis-node too.

ISSUE TYPE

• Bug Report

COMPONENT NAME

Cmd.

OASIS NODE VERSION

Software version: 24.2
Consensus:
  Consensus protocol version: 7.0.0
Runtime:
  Host protocol version:      5.1.0
  Committee protocol version: 5.0.0
Go toolchain version: 1.22.2