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ARROW-18157: [Dev][Archery] "archery docker run" sets env var to None when inherited (#14501)

This would occur when:
* an environment variable is set to inherited in `docker-compose.yml`
* the variable isn't set in the calling environment
* Archery uses `docker` instead of `docker-compose` to run the container (for example because it's a GPU job)

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>