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2374e4e81c
Refactor Unbound DNS installation to use modern `conf.d` pattern and add E2E testing. **Changes:** - Unified Unbound config across all distros using `/etc/unbound/unbound.conf.d/openvpn.conf` - Added startup validation with retry logic - Added `ip-freebind` to allow binding before tun interface exists - E2E tests now verify Unbound DNS resolution from VPN clients **Testing:** - Server: verifies config creation, interface binding, security options - Client: verifies DNS resolution through Unbound (10.8.0.1) --- Closes https://github.com/angristan/openvpn-install/issues/602 Closes https://github.com/angristan/openvpn-install/pull/604 Closes https://github.com/angristan/openvpn-install/issues/1189 Co-authored-by: Henry N <henrynmail-github@yahoo.de>