ResourceInitializationError: unable to pull secrets or registry auth: execution resource retrieval failed: unable to retrieve ecr registry auth: service call has been retried 3 time(s): RequestError: send request failed caused by: Post “https://api.ecr.ap-northeast-1.amazonaws.com/”: dial tcp 52.119.218.165:443: i/o timeout

ECRからPullできないというエラー

Public Subnetの場合はIPの自動振り分けを有効化させてください。