Add docker_images release step to CI pipeline
What does this MR do?
The pipeline adds a step which builds and releases Runner's docker images. It also fixes a problem when a release (both docker-based and S3-based) for older stable branch was marked as the latest.
Why was this MR needed?
Please look into #1713 (closed) and #1681 (closed) for a reference.
Are there points in the code the reviewer needs to double check?
@ayufan Do we want to store images also in our registry? If no, then I can make the ci/release_docker_images much simpler.
Does this MR meet the acceptance criteria?
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Documentation created/updated - Tests
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Added for this feature/bug -
All builds are passing
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Branch has no merge conflicts with master(if you do - rebase it please)