从Jenkins构建Docker映像时找不到.jar文件（选择了错误的目录）

Question

我正在尝试从詹金斯管道构建图像：

stage("Build and Publish") {   
  steps {
    withDockerRegistry(dockerCredentials) {
      sh "pwd" // returns /var/lib/jenkins/workspace/my-project
      sh "docker build -t='my-hub/my-project-indexer:${env.GIT_TAG}' indexer/"
      sh "docker push my-hub/my-project-indexer:${env.GIT_TAG}"
      sh "docker build -t='my-hub/my-project-web:${env.GIT_TAG}' web/"
      sh "docker push my-hub/my-project-web:${env.GIT_TAG}"
    }
  }
}

Dockerfile看起来像这样：

FROM openjdk:8

RUN mkdir /logs && chown 1:1 -R /logs

WORKDIR /

USER user

ADD target/scala-2.11/indexer.jar /app/indexer.jar

VOLUME /logs

CMD [ "java", "-jar", "/app/indexer.jar" ]

有趣的是，ADD步骤失败，并显示以下消息-ADD failed: stat /opt/app/docker/tmp/docker-builder255975818/target/scala-2.11/indexer.jar: no such file or directory。

当我显然位于项目根目录中时，我不知道为什么docker使用/opt/app/docker/tmp/docker-builder...文件夹。我是Jenkins和Docker的新手，所以对可能出现的愚蠢问题提前致歉。