Make signup/login optionnal with a docker envar

[beeksiwaais]

Is your feature request related to a problem? Please describe.
Currently, the signup/login process is mandatory when using the tool, which can be cumbersome for users who want to quickly test or deploy it without going through the signup process.

Describe the solution you'd like
I propose making the signup/login process optional by introducing a Docker environment variable. This would allow users to bypass the signup/login step if they choose to do so, enhancing flexibility and ease of use.

Describe alternatives you've considered
One alternative could be to provide a separate lightweight version of the tool that doesn't require signup/login. However, this could lead to maintenance challenges in managing two different versions of the tool.

Additional context
This feature would significantly improve the user experience for developers and testers who frequently spin up instances of the tool for various purposes, streamlining the setup process and saving time.

[tjbck]

Duplicate #1898 #929