无法将图像从詹金斯部署到Docker

Question

我正在尝试从jenkins向docker部署映像，该映像也从docker运行。 从詹金斯，我得到以下堆栈跟踪：

    Caused by: net.rubygrapefruit.platform.NativeException: Could not start 'docker'
    at net.rubygrapefruit.platform.internal.DefaultProcessLauncher.start(DefaultProcessLauncher.java:27)
    at net.rubygrapefruit.platform.internal.WrapperProcessLauncher.start(WrapperProcessLauncher.java:36)
    at org.gradle.process.internal.ExecHandleRunner.startProcess(ExecHandleRunner.java:98)
    at org.gradle.process.internal.ExecHandleRunner.run(ExecHandleRunner.java:71)
    ... 4 more
Caused by: java.io.IOException: Cannot run program "docker" (in directory "/var/jenkins_home/workspace/pipeline/build/docker"): error=13, Permission denied
    at net.rubygrapefruit.platform.internal.DefaultProcessLauncher.start(DefaultProcessLauncher.java:25)
    ... 7 more
Caused by: java.io.IOException: error=13, Permission denied
    ... 8 more

这是相关的詹金斯文件部分

    stage('Deploy') {
        steps {
            sh './gradlew docker dockerRun --stacktrace'
        }
    }

，也是负责部署的gradle脚本的一部分

docker {
    name "registry/spring-boot-api-example:1.1"
    files "build/libs/${bootJar.archiveFileName.get()}"
    buildArgs([JAR_FILE: bootJar.archiveFileName.get()])
}

以及包含jenkins容器配置的docker-comose文件

jenkins:
    image: jenkins/jenkins:2.235.1-lts-centos7
    privileged: true
    hostname: jenkins
    user: root
    ports:
      - '8080:8080'
      - '50000:50000'
    container_name: jenkins
    environment:
      - JENKINS_OPTS="--prefix=/jenkins"
    volumes:
      - ./jenkins:/var/jenkins_home
      - /var/run/docker.sock:/var/run/docker.sock
      - /usr/local/bin/docker:/usr/local/bin/docker