creates a github installation for the team, returns the installation link

{
  "config_url": "string",
  "github_install_url": "string",
  "github_target_name": "string",
  "github_target_url": "string",
  "id": "string",
  "oauth_auth_url": "string",
  "oauth_base_url": "string",
  "oauth_client_id": "string",
  "oauth_client_secret": "string",
  "oauth_git_clone_prefix": "string",
  "oauth_redirect_url": "string",
  "oauth_scopes": [
    "string"
  ],
  "oauth_token_url": "string",
  "repo_manager": "github",
  "team_id": "string"
}