How to build and deploy ROS product?

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I am working on building a ROS product, I have some custom packages which run on ROS Melodic. I want to sell it as a product to my clients in such a way that the source code is protected and easy to use.

Also in general if anyone can share how ROS-based robotics products are built and how software is shipped. How to provide OTA updates to robots. How can a docker/container be used in such case?