Ok so to summarize:
I re-flash Gladys with the latest image on my SD card. (I have the tasmota module inside I think I have the right version but since I don’t know what to delete I have to start from there)
I install docker
I install the Gladys version I want to test with docker (the one with the 433 module)
then I imagine I can’t modify anything, just test.
I’d be happy to provide feedback on https://community.gladysassistant.com/t/test-image-raspbian-beta but it’s too vague it will take me a week just to install the mess. 
I’ll go take my developer’s master and I’ll be back!