I am evaluating retool to build an admin UI on top of our DB so I would like to test it locally first.
I run the docker container putting as LICENSE_KEY= LOCAL_DEV. But with this I am not able to do anything, the moment it started it said that my trial has ended. Is there an easy way to test retool locally?
Welcome to the community, @theHappyOstrich! Thanks for reaching out. 
You can sign up for a free self-serve license key at https://my.retool.com/, which will even let you deploy the instance and test everything in the context of your org's infrastructure. I hope that helps! Let me know if you have any additional questions.