remove nftables installation from Dockerfile and clean up firewall-add script

Dockerfile

@@ -1,5 +1,5 @@
 FROM alpine
 
-RUN apk add --update --no-cache iptables iptables-legacy openssl jq curl ca-certificates busybox-extras docker-cli nftables
+RUN apk add --update --no-cache iptables iptables-legacy openssl jq curl ca-certificates busybox-extras docker-cli
 COPY firewall/ /firewall/
 CMD firewall/iptables-wrapper-installer.sh && /firewall/firewall-add

firewall/firewall-add

@@ -484,9 +484,6 @@ for source_ip_index in $(seq 1 $COUNT_SOURCE_IP); do
                         else
                             debug "$IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT"
                             $IPTABLES -w -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT
-                            if [ "$IPTABLES" == "/usr/sbin/iptables" ]; then
-                                /usr/sbin/nft delete table ip raw 2>/dev/null || true
-                            fi
                         fi
                     fi
                     #############################