Use default credential chain if credentialsfile not specified #12
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At the moment, credentials must come from the
credentialsfile
setting in the config file because the AWS SDK credentials chain has been replaced.This means it isn't possible to use environment variables to specify the credentials at all, or from the instance/container IAM role if we ever decide to go down that road.
This change makes go-minipypi only replace the default credential chain if credentialfile is specified in the config. If not, then the default credential chain will be used, i.e. the order defined here - https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/configuring-sdk.html#specifying-credentials