FIx deprecated "MAINTAINER" in Dockerfile

[yankay]

"MAINTAINER" in Dockerfile is deprecated , refer to the https://docs.docker.com/engine/reference/builder/#maintainer-deprecated.

Change it to label.

Signed-off-by: Kay Yan kay.yan@daocloud.io

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[vteratipally]

Thank you for the change. /ok-to-test /lgtm

[vteratipally]

/ok-to-test
/lgtm

[vteratipally]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vteratipally, yankay

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