在尝试遵循此链接中列出的说明时： https://cloud.google.com/solutions/cicd-pipeline-for-data-processing
我一直进行到构建步骤，但是遇到了这个错误：
Step #1 - "build-jar": [ERROR] The goal you specified requires a project to execute but there is no POM in this directory (/workspace/data-pipeline-source/data-processing-code). Please verify you invoked Maven from the correct directory. -> [Help 1]
Step #1 - "build-jar": [ERROR]
Step #1 - "build-jar": [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
Step #1 - "build-jar": [ERROR] Re-run Maven using the -X switch to enable full debug logging.
Step #1 - "build-jar": [ERROR]
Step #1 - "build-jar": [ERROR] For more information about the errors and possible solutions, please read the following articles:
Step #1 - "build-jar": [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProjectException
Finished Step #1 - "build-jar"
ERROR
ERROR: build step 1 "gcr.io/cloud-builders/mvn" failed: exit status 1
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有什么想法要解决吗？