Fix tini-git image to be multi-arch

[vdemeester]

Changes

The previous image was built for amd64 only, which makes any image using it as base image (such as the resolvers one) also only targeting amd64.

/kind bug

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
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Release Notes

Updating tini-git base image to be multi-platform, also fixing the resolvers image.

[vdemeester]

/cherry-pick release-v1.3.x

[tekton-robot]

@vdemeester: once the present PR merges, I will cherry-pick it on top of release-v1.3.x in a new PR and assign it to you.

In response to this:

/cherry-pick release-v1.3.x

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[vdemeester]

/cc @afrittoli @waveywaves @twoGiants

[waveywaves]

/kind bug
/retest

[afrittoli]

/retest

[afrittoli]

/test check-pr-kind-label

[tekton-robot]

@afrittoli: No presubmit jobs available for tektoncd/pipeline@main

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/test check-pr-kind-label

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[afrittoli]

/approve

[AlanGreene]

/test check-pr-has-kind-label

[tekton-robot]

@AlanGreene: No presubmit jobs available for tektoncd/pipeline@main

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/test check-pr-has-kind-label

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[waveywaves]

/check-pr-has-kind-label

[waveywaves]

/retest

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli, twoGiants

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[twoGiants]

/test check-pr-has-kind-label

[tekton-robot]

@twoGiants: No presubmit jobs available for tektoncd/pipeline@main

In response to this:

/test check-pr-has-kind-label

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[twoGiants]

/lgtm

[tekton-robot]

@vdemeester: new pull request created: #8948

In response to this:

/cherry-pick release-v1.3.x

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.