POST /products/{productId}/variants/{variantId}/media-assets

curl --request POST \
  --url https://admin.fanfare.io/api/products/{productId}/variants/{variantId}/media-assets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mediaAssetId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "position": 123
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "mediaAsset": {
    "archived": true,
    "createdAt": "2023-11-07T05:31:56Z",
    "createdBy": "<string>",
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "organizationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "altText": "<string>",
    "description": "<string>",
    "publicUrl": "<string>",
    "sourceUrl": "<string>",
    "thumbnailUrl": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z",
    "updatedBy": "<string>",
    "uploadUrl": "<string>"
  },
  "mediaAssetId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organizationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "position": 1,
  "variantId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}