podTemplate(name: "mypod", label: "label", containers: [
                        containerTemplate(name: 'debian',
                                image: 'debian',
                                ttyEnabled: true,
                                command: 'cat',
                        )
]) {
    node("label") {
        container('debian') {
            sh 'for i in $(seq 1 1000); do echo $i; sleep 0.3; done'
        }
    }
}

[Pipeline] podTemplate
[Pipeline] {
[Pipeline] node
Running on horst-nwmsn-32h5h in /home/jenkins/workspace/full
[Pipeline] {
[Pipeline] container
[Pipeline] {
[Pipeline] sh
[full] Running shell script
+ seq 1 1000
+ echo 1
1
+ sleep 0.3
+ echo 2
2
+ sleep 0.3
[Pipeline] }
[Pipeline] // container
[Pipeline] }
[Pipeline] // node
[Pipeline] }
[Pipeline] // podTemplate
[Pipeline] End of Pipeline
ERROR: script returned exit code -1
Finished: FAILURE