frontend: Set frontend hostname as an env var

[malexw]

The frontend needs to know its URL in order to do single sign-on, so let's set it as an environment variable.

AI Description

This pull request introduces a new environment variable, NEXT_PUBLIC_FRONTEND_HOSTNAME, which specifies the URL for the frontend client. This variable is added to multiple configuration files and scripts to ensure consistent usage across the application.

• .env-template: The NEXT_PUBLIC_FRONTEND_HOSTNAME variable is added with a default value of http://localhost:4000.
• docker-compose.yml: The NEXT_PUBLIC_FRONTEND_HOSTNAME variable is included in the environment section, allowing it to be set directly in the Docker Compose file.
• docker_scripts/env-defaults: A new export statement is added for NEXT_PUBLIC_FRONTEND_HOSTNAME, defaulting to http://localhost:4000.
• docs/setup.md: Documentation is updated to include NEXT_PUBLIC_FRONTEND_HOSTNAME in the list of environment variables. It describes its purpose as "The URL for the frontend client" and provides the default value.
• src/backend/cli/main.py: The NEXT_PUBLIC_FRONTEND_HOSTNAME_DEFAULT variable is introduced with a value of http://localhost:4000. This default value is used when prompting for the frontend hostname during the configuration process.
• src/interfaces/coral_web/.env.development and .env.production: The NEXT_PUBLIC_FRONTEND_HOSTNAME variable is added to both development and production environment configuration files, setting the frontend hostname to http://localhost:4000.
• src/interfaces/coral_web/src/env.mjs: The NEXT_PUBLIC_FRONTEND_HOSTNAME variable is included in the createEnv configuration, allowing it to be accessed within the application.
• src/interfaces/coral_web/src/hooks/authConfig.ts: The baseUrl is updated to use the value of NEXT_PUBLIC_FRONTEND_HOSTNAME from the env.mjs module.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@487f01b). Learn more about missing BASE report.

Files	Patch %	Lines
src/backend/cli/main.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage        ?   85.27%           
=======================================
  Files           ?      161           
  Lines           ?     5928           
  Branches        ?        0           
=======================================
  Hits            ?     5055           
  Misses          ?      873           
  Partials        ?        0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.