Improve library development

[quevon24]

I implemented a few things that may be useful for developers:

• Allow code reload (you currently need to rebuild the image to test your changes)
• Allow use .env file to set DEBUG to true or false (useful when testing the microservices)
• Map mock web app to be accessible via localhost for testing microservices endpoints updating docker-compose file (Now you can use a software like postman to access to endpoints. e.g. http://localhost:5050/utils/file/extension/ )
• Exclude files generated from Jetbrains programs

[mlissner]

Nice improvements, thanks.