.gitlab-ci.yml: Persist result vars between script & after_script

Tom Pollardrequested to merge
tpollard/export_vars into staging

Description

after_script is executed in a new shell, as such it doesn't have
access to previously exported vars.

This merge request, when merged, will address issue/bug:

https://groups.google.com/g/remote-execution-apis/c/zw_YDvbHAKM/m/ExJT1N70BQAJ

Edited by Tom Pollard

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