fix: correct error in OpenShift registry credential provider

[matejvasek]

Changes

• 🐛 Return correct error in OpenShift registry credential provider

/kind bug

fix: empty credentials issue for docker.io

[codecov]

Codecov Report

Merging #1104 (d3cf5e0) into main (dad6047) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main    #1104   +/-   ##
=======================================
  Coverage   44.90%   44.90%           
=======================================
  Files          64       64           
  Lines        8502     8502           
=======================================
  Hits         3818     3818           
  Misses       4300     4300           
  Partials      384      384           

Impacted Files	Coverage Δ
docker/creds/credentials.go	69.25% <50.00%> (ø)

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[zroubalik]

/lgtm
/approve

/hold for tests

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matejvasek, zroubalik

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• OWNERS [matejvasek,zroubalik]

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[matejvasek]

/unhold