Add debug message on job fail

[pstray]

Summary

Just a simple patch to add a debug log on job fail.

Could possibly add some check if there already are on-fail events hooks, but not sure how to do that :)

Motivation

I find it really useful to actually see if a job fail in the terminal running ./app minion worker, and not have to inspect the web interface or add promises or hooks to jobs.

References

Was discussed on #mojo earlier this week

[kraih]

Pretty sure i already said on IRC that this is not the right solution. The Mojo::Job class should not be tied to a Mojolicious app.

[kraih]

The job id is missing from the log message also. And debug is probably not the right level.

[kraih]

Not to mention the lack of tests.

[pstray]

Ok, moved the message from Minion/Job.pm to Minion/Command/worker/minion.pm. Sounds like a much more appropriate place for it.

Still no tests though, mostly because I have no idea how to test it :)

Wether it should be debug or some other level can be discussed, but the other messages in that file are debug, and for me, I mostly use such things for debugging. If you really want to do anything with those error messages, I guess you should handle them in other ways in the app itself.

[kraih]

That's a lot of code for what could have been a one-liner.

[pstray]

Removed one of the functions, _dequeue, and fixed the indentation and some spacing to match the other code. Still, a bit more than a one-liner, but that wouldn't be very readable code :)