ElasticBeanstalkでのデプロイで'You need to install git to be able to use gems from git repositories.'AWSElasticBeanstalk $ eb deploy WARNING: Deploying a previously deployed commit. INFO: Environment update is starting. INFO: Deploying new version to instance(s). ERROR: [Instance: xxxxxx] Command failed on instance. Return code: 11 Output: (TRUNCATED)...rubygems.org/........ Fetching additional metadata