Accept env argument from the terminal

This is used to determine the letsencrypt endpoint to hit.

I used to have a single variable for the endpoint, and I would uncomment the
prod or nonprod endpoint depending on the circumstances.

The two endpoints are given in separate variables in the config file:
acme_server_nonprod and acme_server_prod. Likewise, the renew_script variable
has been split into renew_script_nonprod and renew_script_prod. Choose between
them using the argument.

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