support OCI image index at manifest endpoint

[rchincha]

Signed-off-by: Ramkumar Chinchani [email protected]

What type of PR is this?

bug

Which issue does this PR fix:

https://github.com/project-zot/zot/issues/640

What does this PR do / Why do we need it:

Adds support for OCI image index at manifest endpoint.

If an issue # is not available please add repro steps and logs showing the issue:

Testing done on this change:

Automation added to e2e:

Will this break upgrades or downgrades?

Does this PR introduce any user-facing change?:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov[bot]]

Codecov Report

Merging #638 (e497267) into main (b9b233e) will increase coverage by 0.11%. The diff coverage is 87.19%.

@@            Coverage Diff             @@
##             main     #638      +/-   ##
==========================================
+ Coverage   88.37%   88.49%   +0.11%     
==========================================
  Files          65       65              
  Lines       11872    12104     +232     
==========================================
+ Hits        10492    10711     +219     
- Misses       1084     1093       +9     
- Partials      296      300       +4     

Impacted Files	Coverage Δ
pkg/storage/s3/s3.go	86.10% <85.00%> (+0.29%)	:arrow_up:
pkg/storage/local.go	84.21% <89.34%> (+0.78%)	:arrow_up:
pkg/cli/root.go	94.70% <0.00%> (+2.11%)	:arrow_up:

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