element.py: Expand variables in sandbox config
This expands variables in project and element sandbox
config.
This MR is a replacement for !1909 (closed), see !1909 (comment 339299442).
Fixes: #1303 (closed)
This expands variables in project and element sandbox
config.
This MR is a replacement for !1909 (closed), see !1909 (comment 339299442).
Fixes: #1303 (closed)