[WIP] Fix environment variables for idweb3-ui service in docker-compose

[Copilot]

Fix Docker networking environment variables for proper service communication

• Update docker-compose.yml environment variables for idweb3-ui service:
  • Change REACT_APP_API_URL from http://localhost:3001 to http://idweb3-api:3001
  • Change REACT_APP_GUARDIAN_URL from http://localhost:3000 to http://guardian-ui
• Update frontend Dockerfile to pass environment variables during build stage (ARG/ENV)
• Update frontend App.js to use REACT_APP_GUARDIAN_URL environment variable instead of hardcoded localhost:3000
• Verify if idweb3-api needs to expose port 80 for Sliplane hosting (currently exposes 3001)
• Test the changes to ensure proper Docker networking

Original prompt

Fix the environment variables in docker-compose.yml for the idweb3-ui service to use service names instead of localhost for proper Docker networking. Specifically, change REACT_APP_API_URL from http://localhost:3001 to http://idweb3-api:3001 and REACT_APP_GUARDIAN_URL from http://localhost:3000 to http://guardian-ui. Additionally, if the API is meant to be accessible externally, ensure the idweb3-api service exposes port 80 or adjust the deployment accordingly for Sliplane hosting.

This pull request was created as a result of the following prompt from Copilot chat.

Fix the environment variables in docker-compose.yml for the idweb3-ui service to use service names instead of localhost for proper Docker networking. Specifically, change REACT_APP_API_URL from http://localhost:3001 to http://idweb3-api:3001 and REACT_APP_GUARDIAN_URL from http://localhost:3000 to http://guardian-ui. Additionally, if the API is meant to be accessible externally, ensure the idweb3-api service exposes port 80 or adjust the deployment accordingly for Sliplane hosting.

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