[Feat]: Adding more preevy environment variables

[ChrisTitos]

What feature?

Hi,
We're setting up preevy and we've run into some minor annoyances.

From what I understand, the only preevy-related environment variable we can use is PREEVY_BASE_URI_{SERVICE}, however this is not sufficient for our needs for multiple reasons;

• Our application (PHP) needs to know the domain it is running on. Just the domain so now we would have to do some parsing in the application to get that.
• We use minio as an S3 development alternative, and for that we need the url to the service. However the one in the preevy environment variable is http instead of https, and it has a trailing slash, which we don't need.

Describe the solution you'd like

All our cases would be solved if we could get more preevy environment variables, like:

• the environment id (with this we could build the url ourselves)
• just the host name, without the scheme and no trailing slashes

Describe alternatives you've considered

No response

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