Redirect stdout and stderr to logfile

[strk]

This is to have panic messages logged, mostly.
See gogs/gogs#3893

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[tboerger]

And for docker I would expect the opposite, drop the log files and print everything to stdout and stderr.

[lunny]

Anyone work on this?

[tboerger]

Nobody claimed it, but as said above I wish we can get rid of all log files for the docker container

[strk]

@lunny please go ahead, for 1.0.0 I'd like to have a working setup outside of docker, further tweaks (like an option to only log to stdout) would be nice for 1.1.x

[lunny]

Maybe we could resolve all log issues in 1.1

[lunny]

I put this to v1.2 since nobody could send a PR to resolve this.