Log a warning when loading bundle manifests with multiple documents

[omertuc]

decodeFileFS reads only the first YAML document in a manifest and
ignores the rest of the documents in that file. This commit makes
it so that it will log a warning when more than one document is
encountered in a single manifest file.

Motivation for the change:
Inspired by this annoying bug: https://gitlab.com/nvidia/kubernetes/gpu-operator/-/merge_requests/254

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

Hi @omertuc. Thanks for your PR.

I'm waiting for a operator-framework 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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.

[dinhxuanvu]

/ok-to-test

[omertuc]

Force-pushed to fix indentation / lint / rebase

[omertuc]

Force pushed again to fix DCO

[codecov]

Codecov Report

Merging #708 (ce63d0d) into master (c426f78) will increase coverage by 0.03%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #708      +/-   ##
==========================================
+ Coverage   51.04%   51.08%   +0.03%     
==========================================
  Files         103      103              
  Lines        9050     9056       +6     
==========================================
+ Hits         4620     4626       +6     
  Misses       3553     3553              
  Partials      877      877              

Impacted Files	Coverage Δ
pkg/registry/parse.go	73.68% <75.00%> (ø)
pkg/registry/decode.go	82.14% <100.00%> (+4.87%)	⬆️

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[jmrodri]

Just some comments and a question.

[kevinrizza]

/approve

[jmrodri]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jmrodri, kevinrizza, omertuc

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• OWNERS [kevinrizza]

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