Don't cut everything after an equals sign

[blacksails]

I tried to provide a build build arg like this: --build-arg ARG_WITH_EQUALS="This has an = char" which results in $ARG_WITH_EQUALS having a value of This has an

[googlebot]

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[container-tools-bot]

Hi @blacksails. 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.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[blacksails]

I signed it!

[googlebot]

CLAs look good, thanks!

[blacksails]

Just fyi i pushed an image with the fix to lixtech/kaniko, and i seems to work as intended.

[priyawadhwa]

LGTM, thanks for fixing this!