Better OCI compatibility

[jonesbusy]

Fix #141

Testing done

Automated

Tested with ORAS and test java cli

CLI Go

{
    "annotations": {
        "org.opencontainers.image.created": "2025-02-23T09:50:04Z"
    },
    "artifactType": "application/vnd.unknown.artifact.v1",
    "config": {
        "data": "e30=",
        "digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
        "mediaType": "application/vnd.oci.empty.v1+json",
        "size": 2
    },
    "layers": [
        {
            "annotations": {
                "org.opencontainers.image.title": "hello.txt"
            },
            "digest": "sha256:7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730",
            "mediaType": "application/vnd.oci.image.layer.v1.tar",
            "size": 4
        }
    ],
    "mediaType": "application/vnd.oci.image.manifest.v1+json",
    "schemaVersion": 2
}

Java

{
    "annotations": {
        "org.opencontainers.image.created": "2025-02-23T09:50:04Z"
    },
    "artifactType": "application/vnd.unknown.artifact.v1",
    "config": {
        "data": "e30=",
        "digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
        "mediaType": "application/vnd.oci.empty.v1+json",
        "size": 2
    },
    "layers": [
        {
            "annotations": {
                "org.opencontainers.image.title": "hello.txt"
            },
            "digest": "sha256:7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730",
            "mediaType": "application/vnd.oci.image.layer.v1.tar",
            "size": 4
        }
    ],
    "mediaType": "application/vnd.oci.image.manifest.v1+json",
    "schemaVersion": 2
}

Except the date, the rest is similar

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.73%. Comparing base (f1c8c3d) to head (f746747).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/Config.java	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #142      +/-   ##
============================================
+ Coverage     80.99%   81.73%   +0.74%     
- Complexity      224      225       +1     
============================================
  Files            19       20       +1     
  Lines           884      887       +3     
  Branches         93       93              
============================================
+ Hits            716      725       +9     
+ Misses          114      109       -5     
+ Partials         54       53       -1     

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[jonesbusy]

Still missing io.deis.oras.content.digest

See https://github.com/search?q=org%3Aoras-project%20%22io.deis.oras.content.digest%22&type=code

Will do an other PR related to directory compression