Use vnd.docker.distribution.manifest.list.v2+json format when building manifests

[mbaldessari]

Tested on my org as follows:

crane manifest quay.io/rhn_support_mbaldess/patterns-operator@sha256:2eb7d7f7197717e8c04fbe0104e674d98c472777c815404297ada562871ec9c4 | jq .
{
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
  "manifests": [
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 594,
      "digest": "sha256:9817d0f2aa8eb2707d6de85cdfed06fa7c275b46630b5a5b590064e0a9a66a5a",
      "platform": {
        "architecture": "amd64",
        "os": "linux"
      }
    }
  ]
}

Without this change the output was:

crane manifest quay.io/rhn_support_mbaldess/patterns-operator@sha256:873bf02df22717e4639a9db857b67e5799a021412723269eaa7a68b40cee3534 | jq .
{
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
  "config": {
    "mediaType": "application/vnd.docker.container.image.v1+json",
    "size": 9416,
    "digest": "sha256:4060132abd5525240c8b89f6d1ba1fe1031ebec70f7d7646530067a6717d7513"
  },
  "layers": [
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 40031119,
      "digest": "sha256:75bed6ef625ff772ca48f63f12693f16f2b44649aa07030a7c4bc6b85225d5dd"
    },
    {
      "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
      "size": 25169664,
      "digest": "sha256:aaece705b986271d700842e9b5218838419346f0a5a5837c14c7f20b2c589cd8"
    }
  ]
}

Fixes: #774

[openshift-ci]

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