@Override
  public int getSchemaVersion() {
    return schemaVersion;
  }
JSON Template for Docker Manifest List Schema V2.2

<p>Example manifest list JSON:

<pre>{@code
{
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
  "manifests": [
    {
      "mediaType": "application/vnd.docker.image.manifest.v2+json",
      "size": 7143,
      "digest": "sha256:e692418e4cbaf90ca69d05a66403747baa33ee08806650b51fab815ad7fc331f",
      "platform": {
        "architecture": "ppc64le",
        "os": "linux",
      }
    },
    {
      "mediaType": "application/vnd.docker.image.manifest.v2+json",
      "size": 7682,
      "digest": "sha256:5b0bcabd1ed22e9fb1310cf6c2dec7cdef19f0ad69efa1f392e94a4333501270",
      "platform": {
        "architecture": "amd64",
        "os": "linux",
        "features": [
          "sse4"
        ]
      }
    }
  ]
}
}</pre>

@see <a href="https://docs.docker.com/registry/spec/manifest-v2-2/#manifest-list">Image Manifest
    Version 2, Schema 2: Manifest List</a>
jib-core/src/main/java/com/google/cloud/tools/jib/image/json/V22ManifestListTemplate.java