00:39:56[2019-09-04T00:39:56.439Z] + docker run --rm -v /home/jenkins/workspace/moby_PR-39144:/workspace alpine sh -c apk add --no-cache -q git bash && cd /workspace && hack/validate/dco
00:39:57[2019-09-04T00:39:57.724Z] Congratulations! All commits are properly signed with the DCO!