Fix json in kaniko example
What does this MR do?
This MR is related to the documentation. It fixes the issue #342872 (closed) (section named Building an image with kaniko behind a proxy) by proposing a code snippet that generates a valid JSON file.
The problem is fully described in the issue #342872 (closed).
Related issues
This MR is related to issue gitlab-org/gitlab:master#342872.
Edited by Marcel Amirault