Doesn't create a file within docker.inside {}

node {
    docker.image('alpine').inside {
        configFileProvider([configFile(fileId: 'test-123', targetLocation: '/foobar')]) {
            echo "In the container"
            try {
                sh "cat /foobar"
            } catch (Exception exc) {
                println exc
            }
        }
    }

    echo "On the container"
    sh "cat /foobar"
}

[Pipeline] Start of Pipeline
[Pipeline] node
Running on qemu2 in /home/jenkins/workspace/t-jenkins_bug-config-file-docker
[Pipeline] {
[Pipeline] withDockerServer
[Pipeline] {
[Pipeline] sh
+ docker inspect -f . alpine
.
[Pipeline] withDockerContainer
qemu2 does not seem to be running inside a container
$ docker run -t -d -u 0:0 -w /home/jenkins/workspace/t-jenkins_bug-config-file-docker -v /home/jenkins/workspace/t-jenkins_bug-config-file-docker:/home/jenkins/workspace/t-jenkins_bug-config-file-docker:rw,z -v /home/jenkins/workspace/t-jenkins_bug-config-file-docker@tmp:/home/jenkins/workspace/t-jenkins_bug-config-file-docker@tmp:rw,z -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** -e ******** alpine cat
$ docker top e4288736bfaaa9adb71e175384021ae505f1cab767b3ef4219783097b57ffb81 -eo pid,comm
[Pipeline] {
[Pipeline] configFileProvider
provisioning config files...
copy managed file [MyCustom] to file:/foobar
[Pipeline] {
[Pipeline] echo
In the container
[Pipeline] sh
+ cat /foobar
cat: can't open '/foobar': No such file or directory
[Pipeline] echo
hudson.AbortException: script returned exit code 1
[Pipeline] }
[Pipeline] // configFileProvider
[Pipeline] }
$ docker stop --time=1 e4288736bfaaa9adb71e175384021ae505f1cab767b3ef4219783097b57ffb81
$ docker rm -f e4288736bfaaa9adb71e175384021ae505f1cab767b3ef4219783097b57ffb81
[Pipeline] // withDockerContainer
[Pipeline] }
[Pipeline] // withDockerServer
[Pipeline] echo
On the container
[Pipeline] sh
+ cat /foobar
123
456[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline