How to modify the value of global environment variable

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I am defining an environment variable inside "Settings->CI/CD->Environment variables" and initializing value of it as "0". Now as part of CI pipeline, I want to modify the value of this environment variable and want to increase by 1. I am trying to do this in my gulp file:

gulp.task('incrementBuildId', function()
{
    process.env.BUILD_ID = buildId + 1;
});  

However the value of environment variable isn't getting changed. Am I doing anything wrong here? Is there any other way to have a global environment variable and keep changing it's value?