static void hexEncode(StringBuilder dst, byte[] src) {
        for (byte aSrc : src) {
            int v = aSrc & 0xFF;
            dst.append(HEXITS[v >>> 4]);
            dst.append(HEXITS[v & 0x0F]);
        }
    }
Task 4.
<a href="https://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html">Add the Signing Information to the Request</a>
src/main/java/io/fabric8/maven/docker/access/ecr/AwsSigner4.java