[ci] tag Docker images built from the master branch

and use them as astarting point for docker builds on MRs/branches, which should speed up those builds in most cases

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• db303a6f - [ci] tag Docker images built from the master branch, and use them as a

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• 91f32cea - [ci] tag Docker images built from the master branch, and use them as a

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• d470dd49 - [ci][bug] use a more build-specific name for the temp Docker image

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