Use a different 'static' image that supports s390x and ppc

[dprotaso]

Updated image is recommended by Chainguard
Details here: https://www.chainguard.dev/unchained/changes-to-static-git-and-busybox-developer-images-2

Release Note

Support s390x/ppc when building our controllers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.12%. Comparing base (40cd95f) to head (9a46060).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #753   +/-   ##
=======================================
  Coverage   79.12%   79.12%           
=======================================
  Files          17       17           
  Lines        1260     1260           
=======================================
  Hits          997      997           
  Misses        227      227           
  Partials       36       36           

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[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, ReToCode

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[dprotaso]

/cherry-pick release-1.15

[knative-prow-robot]

@dprotaso: new pull request created: #754

In response to this:

/cherry-pick release-1.15

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