In the docker config.json, if `psFormat` or `imagesFormat` is set to a
non-standard format, it breaks autocompletion.
This fixes the issue by using a custom format.
Signed-off-by: Chris Gibson <chris@chrisg.io>
Upstream-commit: b4a1634cec80f58c7bcaa213441f2e81cd405f5e
Component: engine