我想在Jenkinsfile中设置动态变量，下面是我的Jenkinsfile

def determineProjectByBranch(branchName) {
  String projectName = "";

  if (branchName.contains("api")) {
    projectName = "api";
  } else if (branchName.contains("auth")) {
    projectName = "auth";
  }

  return projectName;
}

pipeline {
  agent any

  stages {
    stage("Build") {
      environment {
        PROJECT_NAME = determineProjectByBranch("${GIT_BRANCH}")
      }

      steps {
        script {
          PROJECT_NAME = determineProjectByBranch("${GIT_BRANCH}")
        }
        echo "branch name: ${GIT_BRANCH}"
        echo "project name: " + PROJECT_NAME // it shows empty value
        echo "project name: ${PROJECT_NAME}"
        sh "chmod +x gradlew"
        sh "./gradlew ${PROJECT_NAME}:clean ${PROJECT_NAME}:build"
      }
    }
  }
}

正如你可以看到上面的代码我想使用函数，使它可以设置动态值，但我找不到正确的方式来设置动态变量。
我也尝试了下面的代码，但它也不工作.

def determineProjectByBranch(branchName) {
  String projectName = "";

  if (branchName.contains("api")) {
    projectName = "api";
  } else if (branchName.contains("auth")) {
    projectName = "auth";
  }

  return projectName;
}

def projectName

pipeline {
  agent any

  stages {
    stage("Build") {
      steps {
        script {
          projectName = determineProjectByBranch("${GIT_BRANCH}")
        }
        echo "branch name: ${GIT_BRANCH}"
        echo "project name: " + projectName // it shows empty value
        echo "project name: ${projectName}"
        sh "chmod +x gradlew"
        sh "./gradlew ${projectName}:clean ${projectName}:build"
      }
    }
  }
}

你可能认为函数返回空值，但当我用下面的代码构建时，它显示了预期值

def determineProjectByBranch(branchName) {
  String projectName = "";

  if (branchName.contains("api")) {
    projectName = "api";
  } else if (branchName.contains("auth")) {
    projectName = "auth";
  }

  return projectName;
}

def projectName

pipeline {
  agent any

  stages {
    stage("Build") {
      steps {
        echo "branch name: ${GIT_BRANCH}"
        echo "project name: " + determineProjectByBranch("${GIT_BRANCH}") // it shows expected value
        echo "project name: ${projectName}"
        sh "chmod +x gradlew"
        sh "./gradlew ${PROJECT_NAME}:clean ${PROJECT_NAME}:build"
      }
    }
  }
}

我不确定定义变量取决于Jenkins版本，但我的版本是2.361.2。如有任何帮助，将不胜感激，提前感谢🙇