Allow the usen of the "env" directive in contexts other than "main"

[German Jaber]

Hi folks,

Is there a reason why the "env" directive is only allowed inside the "main"
contexts?

It would simplify many of my Docker deployments if I could do away with sed
and envsubst and use the "env" directive directly.

If the maintainers approve the inclusion of this feature in Nginx, I would
like to offer my time to this project by implementing this functionality.

Regards, German Jaber
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