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I am not sure if I am getting your problem correctly, so we have repo1/branchA and repo2/branchA as a source for all the artifacts and we want to have all done in one go by branchA from both repos?
no problem @user16635. The only thing that I have in mind is to trigger one build when the first is finished. But I'm not sure is such build-chain will not give you more struggle with CI configuration