To dynamically change the backend URL in your dockerized React.js application, you can use a configuration file that is read at runtime. This file should contain the backend URL and be generated dynamically for each environment. In your React.js code, read the backend URL from the configuration file and use it as the base URL for your API requests.

To generate the configuration file, you can use a Bash script that reads the environment variable for the backend URL and writes it to the configuration file. In your production docker-compose file, you can mount the configuration file as a volume in the container that runs the React.js application.

This approach allows you to dynamically change the backend URL without relying on environment variables, which cannot be changed after the production frontend is built.
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