ci: Bump linux image tag, and make a separate tag for windows
It is fairly common to rebuild only the linux or windows image. This avoids needless rebuilds and then (v slow) downloads into the docker cache of runners. Part-of: <!1500>
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
It is fairly common to rebuild only the linux or windows image. This avoids needless rebuilds and then (v slow) downloads into the docker cache of runners. Part-of: <!1500>
mentioned in merge request gst-plugins-rs!1731 (merged)