title: Change node env var in Cypress
body: <p>I'm using Cypress, and I have in my code &quot;process.env.VUE_APP_API_URL&quot;. This variable is defined in my .env.development file.
  I want to modify this variable when I'm running Cypress.</p>
  <p>How to do that ?</p>
  <p>Note : To lanch Cypress, I use the command ./node_modules/.bin/cypress open</p>