Base URL is overwritten on bucket input blur

[timkelty]

It tries to infer the base url, but it should really only do this if that field is empty.

Screencast:
https://drive.google.com/file/d/10Te4cS53NojIQDyXEKO1i36nhNR_wS8d/view

[beporter]

As a corollary to this, if the bucket name is set to an environment variable, say $S3_BUCKET_NAME, then the auto-generated Base URL gets written as https://s3.[region].amazonaws.com/$S3_BUCKET_NAME/ and used as a literal string without the bucket name being interpolated into the Base URL. This causes requests such as this to appear in the browser:

GET https://s3.us-east-2.amazonaws/$S3_BUCKET_NAME/assets/images/globals/logo.png

...which clearly won't work. 😞

[ccchapman]

This is still an issue.