Storage tag should be available from build variables

Problem Definition

Bamboo 5.12 introduced new way to store artifacts at Bamboo home folder. It's independent from plan key now. There's no way to access this storage tag during a build outside of the directory provided from querying the REST API: https://confluence.atlassian.com/display/BAMBOO/Plan+directory+information+REST+API

Suggested Solution

It should be possible to get storage tag value from build variables, like ${bamboo.plan.storageTag}

Workaround

The storage tag is static and won't change for a plan. While far from ideal, if you know this value you can create it as a plan variable manually for use within your build.

The following SQL will show you your plan to storage tag mappings:

SELECT FULL_KEY,STORAGE_TAG FROM BUILD where build_type in ('CHAIN','CHAIN_BRANCH');