Initial allowlist support

[BeryJu]

closes #1090

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.

Project coverage is 21.56%. Comparing base (e9187d5) to head (84d5e6d). Report is 1 commits behind head on main.

:x: We are unable to process any of the uploaded JUnit XML files. Please ensure your files are in the right format.

Files with missing lines	Patch %	Lines
pkg/roles/dns/handler_forward_blocky.go	56.52%	8 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1271 +/- ## ========================================== + Coverage 21.54% 21.56% +0.01% ========================================== Files 231 231 Lines 19765 19784 +19 ========================================== + Hits 4258 4266 +8 - Misses 15056 15065 +9 - Partials 451 453 +2 ```

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