v.20.12Improvement

Install script should create subdirs in config folders for Docker builds with custom config

Install script should always create subdirs in config folders. This is only relevant for Docker build with custom config. #16936 (filimonov).
The install script for ClickHouse now always creates subdirectories in configuration folders, ensuring proper directory structure.

Why it matters

This change addresses issues in Docker builds with custom configurations by guaranteeing that necessary subdirectories within config folders exist, preventing potential misconfigurations or failures related to missing directories.

How to use it

When using the ClickHouse install script, especially in Docker environments with custom config setups, the required subdirectories in configuration folders will be created automatically without any additional user intervention.