How are you getting around the path issues in the dockerfile (looking at the patches posted in thread, looks like they arent updated), and presuming dockerfile not relocated?
i.e.
[2/7] STEP 5/57: COPY patches/ ./patches/
Error: building at STEP "COPY patches/ ./patches/": checking on sources under "/mnt/d/git/fluxer/fluxer_server": copier: stat: "/patches": no such file or directory
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Comment by @aneillans