Added OCI labels to capi nginx kbld config

[Birdrock]

finishes #177481547

Signed-off-by: Andrew Costa ancosta@vmware.com Co-authored-by: Andrew Costa ancosta@vmware.com

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WHAT is this change about?

Add OCI labels to nginx images built with Carvel toolchain.

Does this PR introduce a change to config/values.yml?

No.

Acceptance Steps

Docker inspect a produced image (pipe to jq .[].Config.Labels) and search for opencontainers annotations.

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/177553154

The labels on this github issue will be updated when the story is started.