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Allow specifying Docker image platform to pull

Muhammed Ali requested to merge gitlab-community/gitlab:image-platform into master

What does this MR do and why?

See !112907 (merged). This MR adds this feature back after it was reverted !137084 (merged).

Added an additional change to handle variables defined at the service level

Closes #431865 (closed), gitlab-runner#27919 (closed), gitlab-runner#28653 (closed)

Allow specifying Docker image platform to pull

It will allow different architecture images to be used on systems that support multi-architectures.

This will add two new syntax in the CI config file;

  • image:docker:platform
  • services:docker:platform

They are sent to Runner via executor_opts, then, they map to the docker pull --platform option.

Changelog: added

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Edited by Muhammed Ali

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