TUTORIAL: Fix docker registry credentials issue

[Peaorl]

Changes

Changing the Kaniko version to v0.16.0 resolves an authentication error when pushing a docker image to a private docker registry.

Fixes #2616

/kind documentation

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[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Peaorl (b8663bc)

[tekton-robot]

Hi @Peaorl. Thanks for your PR.

I'm waiting for a tektoncd 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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[ghost]

/ok-to-test

[ghost]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbwsg

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[vdemeester]

/lgtm