Create a bash shortcut for `docker compose exec` with http proxy

[aldy505]

Feel free to pick up this issue, since it's easy.

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@aldy505 we should have a shortcut for this monstrosity:

$dc exec -e "HTTP_PROXY=${HTTP_PROXY:-}" -e "HTTPS_PROXY=${HTTPS_PROXY:-}" -e "NO_PROXY=${NO_PROXY:-}" -e "http_proxy=${http_proxy:-}" -e "https_proxy=${https_proxy:-}" -e "no_proxy=${no_proxy:-}" 

Originally posted by @BYK in #4060 (comment)