Jenkins pipeline model definition - how to disable with an environment variable

pipeline-disable-early-exit.groovy

// Check for early exit of a pipeline. The env check has to be inside a node.
boolean earlyExit = false
node {
    echo "env.PIPE_DISABLED = ${env.PIPE_DISABLED}"
    if(env?.PIPE_DISABLED == 'true') {
        earlyExit = true
    }
}   
if(earlyExit) {
    echo "Early exit pipeline as disabled"  
    return
}

pipeline {
    
    // Run on any node
    agent label: ""

    stages {
        stage('foo) {
            steps {
                    echo "Foo stage executed"
            }
        }
    }
}