Throw specific errors for 'external_account' type #41
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GitHub ActionsからIDフェデレーションした際などに入手できるクレデンシャルは
"type": "external_account"となっている。これはまだサポートされおらず、実装するのは結構大変そう。
↓ 実装が3つに分岐してる上に中でもさらに色々枝分かれてしていて複雑。
https://github.com/googleapis/google-cloud-node-core/blob/101091260776be70b52ed6277f2cd74bae3bf4be/packages/google-auth-library-nodejs/src/auth/externalclient.ts#L78-L84
とりあえず専用のエラーを出して、サポートできていないことを明確に伝える。
そのほか、エラーの見え方が悪かったりした部分の細かい修正。