curl --request GET \
  --url https://cloud.nexus.app/api/versions

{
  "stable": {
    "Nexus": "<string>",
    "relational_db": "<string>",
    "index": "<string>",
    "nginx": "<string>"
  },
  "dev": {
    "Nexus": "<string>",
    "relational_db": "<string>",
    "index": "<string>",
    "nginx": "<string>"
  },
  "migration": {
    "Nexus": "<string>",
    "relational_db": "<string>",
    "index": "<string>",
    "nginx": "<string>"
  }
}