Take advantage of process.env to create variables and environments

[mitogh]

Steps to reproduce and a minimal demo of the problem

At the moment we have to run:

• npm run js:staging
• npm run js:dev

Current behavior

We need to run a command per environment

Expected/desired behavior

We can use process.env instead to setup custom variables and make scripts to work dynamically based on the environment where those are executed so we have a single command instead of n based on environments.