jenkins-scripts/build/prod/Jenkinsfile

stage ('production build') {
    script {
        def tag = sh(returnStdout: true, script: "git tag --contains").trim()
        def branchName = sh(returnStdout: true, script: "git rev-parse --abbrev-ref HEAD").trim()

        if (tag) {
            echo 'found tag ' + tag
            def tagNoV = tag.substring(1)
            sh "VERSION=${tagNoV} npm run build:prod";
        } else {
            echo 'tag not found'
            sh "VERSION=${branchName} npm run build:prod"
        }

        sh 'ls dist';
    }
}