Add DNSBL querying in conditions

Dockerfile

@@ -43,6 +43,7 @@ ENV GOAWAY_SLOG_LEVEL="WARN"
 ENV GOAWAY_CLIENT_IP_HEADER=""
 ENV GOAWAY_JWT_PRIVATE_KEY_SEED=""
 ENV GOAWAY_BACKEND=""
+ENV GOAWAY_DNSBL="dnsbl.dronebl.org"
 
 EXPOSE 8080/tcp
 EXPOSE 8080/udp
@@ -51,6 +52,7 @@ ENV JWT_PRIVATE_KEY_SEED="${GOAWAY_JWT_PRIVATE_KEY_SEED}"
 
 ENTRYPOINT  /bin/go-away --bind ${GOAWAY_BIND} --bind-network ${GOAWAY_BIND_NETWORK} --socket-mode ${GOAWAY_SOCKET_MODE} \
             --policy ${GOAWAY_POLICY} --client-ip-header ${GOAWAY_CLIENT_IP_HEADER} \
+            --dnsbl ${GOAWAY_DNSBL} \
             --challenge-template ${GOAWAY_CHALLENGE_TEMPLATE} --challenge-template-theme ${GOAWAY_CHALLENGE_TEMPLATE_THEME} \
             --slog-level ${GOAWAY_SLOG_LEVEL} \
             --backend ${GOAWAY_BACKEND}