Dear MIDAS experts,

there is a [small] number of places in the ODB tree, like "Logger/Data dir" or "Custom/Path" which contain paths,
and where one could benefit from using environment variables. 

For example, instead of setting "Custom/Path" explicitly to "/data/custom/path", one could have is set to 
"${CUSTOM_PATH}", where $CUSTOM_PATH would be defined in the environment. This 

Alternatively, could argue that using env vars would make ODB less explicit and have other side effects