ci: Fix Docker image source for MRs
If the MR doesn't modify the Docker context, the pipeline should use the image from upstream.
Signed-off-by: Marek Pikuła m.pikula@partner.samsung.com
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If the MR doesn't modify the Docker context, the pipeline should use the image from upstream.
Signed-off-by: Marek Pikuła m.pikula@partner.samsung.com