fix: use db parameter when constructing redis client

[diogotcorreia]

Fixes #1507

Note: I haven't written Ruby before, so some of the string interpolations can likely be simplified (probably the cable.yml one). Just leave a review and I'll change them :)

[ThxAndBye]

I just ran into the same issue when setting up dawarich:
Not a directory - connect(2) for /run/valkey/valkey.sock/1 (unix:///run/valkey/valkey.sock/1)

Thanks for the PR, I'll continue to setup my instance when this got merged.

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[diogotcorreia]

Fixed merge conflict