[Feature Request] Support automatic creation of admin account during deployment

[Jasonnor]

Is your feature request related to a problem?

Yes. Currently, only the first person to access the front-end can create an admin account through the UI. This approach can be problematic in automated deployment scenarios or when multiple team members need immediate admin access.

Describe the solution you'd like

• Allow setting admin credentials via environment variables (e.g., SIGNOZ_ADMIN_EMAIL, SIGNOZ_ADMIN_NAME, SIGNOZ_ADMIN_PASSWORD)
• Provide command-line arguments or a configuration file option for specifying admin account details during deployment

Describe alternatives you've considered

Using a default admin account with a randomly generated password that's output to logs (requiring immediate password change on first login).

Additional context

This feature would be particularly useful in the following scenarios:

• Automated deployments in CI/CD pipelines
• Container orchestration environments like Kubernetes
• Multi-user teams where multiple admins need to be set up immediately
• Testing and development environments where quick setup is crucial

[welcome]

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