Test userns

Signed-off-by: Matt Lord <[email protected]>

Author: mattlord

.buildkite/pipeline.yml

@@ -43,6 +43,7 @@ steps:
       - docker#v3.12.0:
           image: "docker:latest"
           propagate-environment: true
+          userns: host
           propagate-uid-gid: true
           volumes:
             - "/var/run/docker.sock:/var/run/docker.sock"