当jenkins跑的时候，“'HEAD分离在”

// Jenkinsfile示例
checkout scm: [
    $class: 'GitSCM',
    branches: [[name: 'origin/main']],  // 明确指定分支
    extensions: [],
    userRemoteConfigs: [[url: 'your_repo_url']]
]

# 在Jenkins的Execute Shell步骤中添加
git checkout -b temp_branch ${GIT_COMMIT}

# 如果确实需要detached HEAD状态
echo "Building at commit ${GIT_COMMIT}"
git checkout ${GIT_COMMIT}

git status
git log -1
git branch -v

pipeline {
    agent any
    parameters {
        string(name: 'BRANCH', defaultValue: 'main', description: 'Target branch')
    }
    stages {
        stage('Checkout') {
            steps {
                checkout([$class: 'GitSCM',
                    branches: [[name: "${params.BRANCH}"]],
                    extensions: [],
                    userRemoteConfigs: [[url: 'your_repo_url']]
                ])
            }
        }
    }
}