Capability to enable debug log

[JeanRessouche]

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Desired Behavior

Increasing the log verbosity with an environment variable (usefull with docker) or a config.yaml setting.
Today i have an error 400 on each call that i can't debug as the log returns absolutely nothing.

Current Behavior

Poor log, not params to have more

Alternatives Considered

[github-actions]

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[Roxedus]

Code-server reads the LOG_LEVEL environment variable.