feat: Add dnssec validation and cleanup index

Dockerfile

@@ -2,8 +2,8 @@ FROM --platform=$BUILDPLATFORM python:3.10-alpine AS builder
 
 WORKDIR /app
 
-# Install openssl
-RUN apk add --no-cache openssl
+# Install openssl and delv
+RUN apk add --no-cache openssl bind-tools
 
 COPY requirements.txt /app
 RUN --mount=type=cache,target=/root/.cache/pip \