adding exit 1 when there are not enough command line vars passed to `…

[j0shua]

…run in docker` script

[googlebot]

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[container-tools-bot]

Hi @j0shua. 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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[j0shua]

I signed it!

[googlebot]

CLAs look good, thanks!

[priyawadhwa]

Thanks for your contribution!

[j0shua]

thanks @priyawadhwa !