Expand variables in image.docker.platform before pulling images

Bert Wesargrequested to merge
bertwesarg/gitlab-runner:38488-expand-platform into main

What does this MR do?

Expand variables in image.docker.platform before pulling images

Closes #38488 (closed)

Why was this MR needed?

Variables are not expanded in the platform key. Hence limits the usability in parallel.matrix builds.

What's the best way to test this MR?

Platform variable expansion for docker services should be exercised now.

What are the relevant issue numbers?

Closes #38488 (closed)

Edited by Bert Wesarg

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