Preserve options when doing a cache push

[carlossg]

Otherwise options like insecure are lost

[container-tools-bot]

Hi @carlossg. Thanks for your PR.

I'm waiting for a GoogleContainerTools 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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[carlossg]

For the record this moves forward allowing insecure locally deployed docker registries but doesn't make it work yet, the builds still can't find the cached image even though it is in the repo