add s3 for docker

docker/Dockerfile

@@ -17,6 +17,8 @@ EXPOSE 18888
 EXPOSE 8888
 # master server shared gprc+http port
 EXPOSE 9333
+# s3 server http port
+EXPOSE 8333
 
 VOLUME /data
 

docker/entrypoint.sh

@@ -36,6 +36,14 @@ case "$1" in
   	exec /usr/bin/weed $@ $ARGS
 	;;
 
+  's3')
+  	ARGS="-domainName \"$S3_DOMAIN_NAME\" -key.file \"$S3_KEY_FILE\" -cert.file \"$S3_CERT_FILE\""
+  	if [ -n "$FILER_PORT_8888_TCP_ADDR" ] ; then
+		ARGS="$ARGS -filer=$FILER_PORT_8888_TCP_ADDR:$FILER_PORT_8888_TCP_PORT"
+	fi
+  	exec /usr/bin/weed $@ $ARGS
+	;;
+
   *)
   	exec /usr/bin/weed $@
 	;;