Allow configuration of environment variables for runner services
What does this MR do?
This MR is the continuation of the CC !3441 (closed)
Why was this MR needed?
To add environment variables support to GitLab Runner services
What's the best way to test this MR?
See !3441 (comment 1112836713)
What are the relevant issue numbers?
None
Edited by Romuald Atchadé