config: add support for wildcard from addresses

[calebdoxsey]

Summary

Adds support for from addresses like https://*.example.com.

Related issues

• https://github.com/pomerium/internal/issues/1329

User Explanation

Adds support for * in from addresses that will match 0 or more characters. This can occur anywhere inside the host part of the URL.

Checklist

• reference any related issues
• updated unit tests
• add appropriate tag (improvement / bug / etc)
• ready for review

[coveralls]

Coverage: 63.727% (+0.3%) from 63.454% when pulling 3762419 on cdoxsey/wildcard-from-v2 into bbed421 on main.

[wasaga]

the regex path option won't work with wildcard froms, correct?

[calebdoxsey]

The regex option will still work with wildcard froms. The route match requires all conditions to be met. So the :authority header will be matched against the wildcard from and the path will be matched against regex.