List env vars
convox env
$ convox env
COUNT=0
FOO=bar
TEST=dummy
Edit env interactively
convox env edit
$ convox env edit
Setting ... OK
Release: RABCDEFGHI
Get an env var
convox env get <var>
$ convox env get FOO
bar
Set env var(s)
convox env set <key=value> [key=value]...
$ convox env set FOO=bar
Setting FOO... OK
Release: RABCDEFGHI
Unset env var(s)
convox env unset <key> [key]...
$ convox env unset FOO
Unsetting FOO... OK
Release: RABCDEFGHI