create a vcs connection for Github

curl --request POST \
  --url https://api.nuon.co/v1/vcs/connections \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "github_install_id": "<string>"
}'

{
  "created_at": "<string>",
  "created_by_id": "<string>",
  "github_install_id": "<string>",
  "id": "<string>",
  "updated_at": "<string>",
  "vcs_connection_commit": [
    {
      "author_email": "<string>",
      "author_name": "<string>",
      "created_at": "<string>",
      "created_by_id": "<string>",
      "id": "<string>",
      "message": "<string>",
      "sha": "<string>",
      "updated_at": "<string>",
      "vcs_connection_branch_id": "<string>",
      "vcs_connection_id": "<string>",
      "vcs_connection_repo_id": "<string>"
    }
  ]
}