Close the *os.File connection for the logger.

StdErr outputs a message & the string form of a data structure (`v`) to the stderr stream this is helpful, as Concourse consumes the `stdout` stream for metadata.

Write writes a message to a log file in `/tmp`.

WriteStdin will write the contents of stdin to the log, then return the contents if env var `LOG_DEBUG` != "".

LogFilePattern string format pattern for the log file.