Nextcloud 20, Collabora and Swag - how I got it to work

So over and over again I see posts asking how to get this to work. It just so happens that I managaed to solve this just the other week. I have had Nextcloud (NC) and Collabora (CL) running with NC 18 for a couple of years then I took a decision to dockerize my whole enviroment. So I decided to use images and Discord channel. Among this I updated to NC19 and Collabora stopped working.
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