chore: Added .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

Which issue(s) this PR fixes

Fixes #939

/area provider/ibmcloud

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[k8s-ci-robot]

Welcome @Pradumnasaraf!

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[k8s-ci-robot]

Hi @Pradumnasaraf. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Amulyam24]

/ok-to-test

[mkumatag]

I don't see a lot of difference in the build time in the CI environment but don't see any harm in merging this because this can be helpful in the local environment.

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [mkumatag]

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