Site base URL prefixed with "http://" if set to an environment variable not currently in .env

[mmikkel]

Description

If a site's "Base URL" setting is set to an environment variable (i.e. any value starting with a $) that doesn't actually have a corresponding key in .env, upon saving the site Craft prefixes the value with "http://", which feels like a bug.

Steps to reproduce

1. Set the "Base URL" setting to a non-existent environment variable (e.g. $FOOBAR)
2. Save the site
3. Confirm that Craft has prefixed the environment variable with "http://"

Additional info

• Craft version: 3.5.0-RC6
• PHP version:
• Database driver & version:
• Plugins & versions:

[brandonkelly]

We’ll have to think about the best way to address this. Part of me is thinking we should just stop validating any values that are set to an environment variable altogether.