withCredentials(FileBinding){} ignored when executed in docker.image().inside{...}

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      withCredentials(FileBinding){...} is ignored in docker.image('cloudbees:java-build-tools').inside{...}. The same withCredentials step works in 'standard' linux node.

      See logs below.

      It seems to be because FileBinding#secretsDir() creates a "secretFiles" directory under "node.getRootPath()" that is not 'mounted' in the docker container.

      withCredentials(FileBinding){...} ignored in docker.image(...).inside{...} 
      docker.image('busybox').inside{
    withCredentials([[$class: 'FileBinding', credentialsId: 'secret-file', variable: 'SECRET_FILE']]) {
        sh 'ls -al $SECRET_FILE'
    }
}

      Started by user Cyrille Le Clerc
[Pipeline] Allocate node : Start
Running on vagrant in /home/vagrant/jenkins/workspace/test-credentials-binding
[Pipeline] node {
[Pipeline] sh
[test-credentials-binding] Running shell script
+ docker inspect -f . busybox
.
[Pipeline] Run build steps inside a Docker container : Start
$ docker run -t -d -u 1000:1000 -w /home/vagrant/jenkins/workspace/test-credentials-binding -v /home/vagrant/jenkins/workspace/test-credentials-binding:/home/vagrant/jenkins/workspace/test-credentials-binding:rw -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** busybox cat
[Pipeline] withDockerContainer {
[Pipeline] Bind credentials to variables : Start
[Pipeline] withCredentials {
[Pipeline] sh
[test-credentials-binding] Running shell script
+ ls -al ****
ls: ****: No such file or directory

            Assignee:
            Jesse Glick
            Reporter:
            Cyrille Le Clerc
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              Created:
              Updated:
              Resolved: