Fetches and parses an app manifest from a repository URL.
Injected into the graph builder so it can be unit-tested without network access. Returns the manifest on success, or an error message when it can't be retrieved or parsed.
Optional
Fetches and parses an app manifest from a repository URL.
Injected into the graph builder so it can be unit-tested without network access. Returns the manifest on success, or an error message when it can't be retrieved or parsed.