To package the module for Magento Marketplace, execute make module in the repository root. To clean up, run make clean. To repackage, run make clean && make module.
A Magento Marketplace compatible zip file of the latest tag that contains origin/master will be generated under a pkg directory in the repository root.
Because the latest tag containing origin/master is used, make sure the changes you need in your package are present in the origin/master branch.
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