Some other cool dudes made a serverless OpenAI API compatible proxy for Gemini here: https://github.com/PublicAffairs/openai-gemini

I like that idea, but I don't like always relying on external vendors for my stuff. (Yes, ironic that I am using this to access an external vendor...).

So I dockerized it so I can run it in my homelab. Now, maybe you can use it to do the same.