Method get_app_installation

github/GithubIntegration.py:332–336

:calls: `GET /app/installations/{installation_id} `

(self, installation_id: int)

        return self._get_installed_app(url=f"/users/{username}/installation")

    def get_app_installation(self, installation_id: int) -> Installation:
        """
        :calls: `GET /app/installations/{installation_id} <https://docs.github.com/en/rest/apps/apps#get-an-installation-for-the-authenticated-app>`
        """
        return self._get_installed_app(url=f"/app/installations/{installation_id}")

    def get_app(self) -> GithubApp:
        """