chore: add `.dockerignore`

[Pradumnasaraf]

What this PR does / why we need it:

• This PR will add a .dockerignore file. We need it to reduce the docker image build size and make the build faster. Also good for local development

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[Pradumnasaraf]

/assign @sftim

Can you please review it?

[jberkus]

Looks good, thanks!

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkus, Pradumnasaraf

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