[JENKINS-34654] support copy file from image

Using Docker to control environment is great, but one does not want all build tools, source code and test results to be part of production image. So the need for a multi-step docker build (see https://github.com/docker/docker/issues/7115)

I use to have two Dockerfiles, one to build form source, the second to package binary into production environment. In the middle I need to get binaries from the build image to create second docker build context. As `docker cp` does not support copy from image (https://github.com/docker/docker/issues/7710) I have to create a container, copy, delete container.

Would be nice for docker-pipeline to make this simple by offering a `cp` method on image.

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Originally reported by ndeloof, imported from: support copy file from image

• status: In Review
  
• priority: Minor
  
• component(s): docker-workflow-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 2
  
• imported: 2025-12-07
  

Using Docker to control environment is great, but one does not want all build tools, source code and test results to be part of production image. So the need for a multi-step docker build (see https://github.com/docker/docker/issues/7115)


I use to have two Dockerfiles, one to build form source, the second to package binary into production environment. In the middle I need to get binaries from the build image to create second docker build context. As `docker cp` does not support copy from image (https://github.com/docker/docker/issues/7710) I have to create a container, copy, delete container. 


Would be nice for docker-pipeline to make this simple by offering a `cp` method on image.