feat!: implement artifact manifest handler in the handler package

[wangxiaoxuan273]

Part 4 of #21.

Implemented necessary changes in the handler package.

Signed-off-by: wangxiaoxuan273 wangxiaoxuan119@gmail.com

[wangxiaoxuan273]

To test on terminal:

• push a minimal artifact manifest (should return 201 Created): curl -X PUT -v localhost:5000/v2/mantest/manifests/bc8a5e80bcb03fe9b5d74db83b1c47e6f7e6b7ca -H "Content-Type:application/vnd.oci.artifact.manifest.v1+json" -d '{"mediaType": "application/vnd.oci.artifact.manifest.v1+json"}'
• pull the above artifact manifest (should return 200 OK): curl -v http://localhost:5000/v2/mantest/manifests/sha256:00b8ca112ff0a7d276dd38ee594affe8bace0fee7e6bc01f262c6c21a3ad61fc -H "Accept: application/vnd.oci.artifact.manifest.v1+json"

Testing results:

• push:

  

• pull:

  

[codecov-commenter]

Codecov Report

Merging #31 (cfa30d0) into main (0fce2c9) will decrease coverage by 0.05%. The diff coverage is 37.03%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   57.17%   57.12%   -0.06%     
==========================================
  Files         106      106              
  Lines       10892    10911      +19     
==========================================
+ Hits         6228     6233       +5     
- Misses       3972     3984      +12     
- Partials      692      694       +2     

Impacted Files	Coverage Δ
registry/handlers/manifests.go	52.89% <37.03%> (-1.28%)	:arrow_down:

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