Use AWS credentials Provider chain

Hello,

The AWS SDK provides a builder for the ECR client using a credentials chain which looks for credentials in this order:

Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY (RECOMMENDED since they are recognized by all the AWS SDKs and CLI except for .NET), or AWS_ACCESS_KEY and AWS_SECRET_KEY (only recognized by Java SDK)
Java System Properties - aws.accessKeyId and aws.secretKey
Credential profiles file at the default location (~/.aws/credentials) shared by all AWS SDKs and the AWS CLI
Credentials delivered through the Amazon EC2 container service if AWS_CONTAINER_CREDENTIALS_RELATIVE_URI" environment variable is set and security manager has permission to access the variable, Instance profile credentials delivered through the Amazon EC2 metadata service

It would be a nice enhancement if the plugin uses this chain if the task does not contain the AWS keys set. Happy to contribute if it helps to get this merged.

Thanks!

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