dotenv not working for `sqlx database ...` CLI commands

[xpe]

Currently dotenv isn't working for sqlx database ... commands. This is a regression caused by commit 0e51272. (That commit was created as a response to #1391.)

For example, testing on the master branch that includes 0e51272 :

% sqlx database drop
error: The following required arguments were not provided:
    --database-url <database-url>

USAGE:
    sqlx database drop [FLAGS] --database-url <database-url>

For more information try --help

Testing on a similar branch that excludes the 0e51272 commit:

% sqlx database drop                   
Drop database at postgres://foo_dev@localhost/foo_dev? (y/n): y

The .env file for both is:

DATABASE_URL=postgres://foo_dev@localhost/foo_dev

[xpe]

Please see the PR over at #1432.

[abonander]

Closed by #1432