Add --log-file to gvproxy

[baude]

Add ability specify a log-file for log messages. This PR redirects are logged messages from the logrus logger to a given file. It is intended to help debug gvproxy failures and usage.

[baude]

@mheon ptal

[mheon]

LGTM. We're doing this on the Podman side for gvproxy (setting os.Stdout/Stderr to a file, instead of passing this as an argument) but this is a good utility add

[baude]

LGTM. We're doing this on the Podman side for gvproxy (setting os.Stdout/Stderr to a file, instead of passing this as an argument) but this is a good utility add

@mheon long term, i'm wondering if podman is --log-level debug ... maybe cann gvproxy with this file too and always store in rundir or the like (you know, another memory leak :) )

[mheon]

That's basically what we're doing right now, but only on Windows (where we otherwise run into terminal issues).

[cfergeau]

Ideally we'd send the logs to macos unified logs ( https://developer.apple.com/documentation/os/logging/generating_log_messages_from_your_code?language=objc ), but I haven't figured out how to do that from golang yet ^^

[openshift-ci]

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This pull-request has been approved by: baude, cfergeau

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[cfergeau]

/lgtm