public static String runCommand(String command) {
        return runCommand(command, Paths.get(System.getProperty("user.dir")));
    }
Helper to run a process.

<p>stderr is redirected to stdout in the return value of this method.

@param command String that contains the command and arguments of the command.
@return        Returns the combined stdout and stderr of the process.
@throws RuntimeException if the process returns a non-zero exit code or fails.
smithy-utils/src/main/java/software/amazon/smithy/utils/IoUtils.java