Log: avoid logging all the latex output when the command failed

[humitos]

We are logging all the output to syslog on this command.

Apr 12 04:29:39 build-default-i-0c6cedba9ca4531f0 /supervisord: build readthedocs[1044]: [warning  ] Command latexmk -r latexmkrc -pdf -f -dvi- -ps- -jobname=brushin -interaction=nonstopmode failed:

The output is hundred of lines, which is crazy. We should truncate this output or remove logging or something.

[humitos]

This is the place in code where we need to chunk the output logged,

readthedocs.org/readthedocs/doc_builder/environments.py

Lines 456 to 465 in d3351d5

	if build_cmd.failed:
	if warn_only:
	msg = 'Command {cmd} failed'.format(cmd=build_cmd.get_command())
	if build_cmd.output:
	msg += ':\n{out}'.format(out=build_cmd.output)
	log.warning(
	msg,
	project_slug=self.project.slug if self.project else '',
	version_slug=self.version.slug if self.version else '',
	)

[ericholscher]

@humitos thanks :)

[ericholscher]

Fixed by #9286