[Feature request] Inject CoLa log directory absolute path into an environment variable

[lgatellier]

Context

Writing logs to file from subcommands.

Feature request

In order to centralize logs from all CoLa/cdt subcommands, it would be useful to inject the log directory path as an environment variable (i.e. COLA_LOG_DIR / CDT_LOG_DIR).

This environment variable could be built-in or via a dedicated resource.

Impact

Log files of command launcher and all its installed subcommands could be located in the same directory (i.e. ~/.cdt/logs)

[bhou]

I think it is a good idea. We need to separate the logs for each package to avoid two packages write the same files. So the path could be
{log root}/{remote}/{package}/

[lgatellier]

Maybe it would be more user friendly (but maybe a bit less developer-friendly ?) to use {log root}/{command}/{subcommand} (subcommand being optional of course)