Remove default IPv6 and fast-open option in the dockerfile

docker/alpine/Dockerfile

@@ -6,7 +6,6 @@ FROM alpine
 LABEL maintainer="kev <noreply@datageek.info>, Sah <contact@leesah.name>"
 
 ENV SERVER_ADDR 0.0.0.0
-ENV SERVER_ADDR_IPV6 ::0
 ENV SERVER_PORT 8388
 ENV PASSWORD=
 ENV METHOD      aes-256-gcm
@@ -46,12 +45,10 @@ USER nobody
 
 CMD exec ss-server \
       -s $SERVER_ADDR \
-      -s $SERVER_ADDR_IPV6 \
       -p $SERVER_PORT \
       -k ${PASSWORD:-$(hostname)} \
       -m $METHOD \
       -t $TIMEOUT \
-      --fast-open \
       -d $DNS_ADDRS \
       -u \
       $ARGS