[docker] refine Dockerfile

tools/docker/Dockerfile

@@ -4,6 +4,7 @@ RUN go get -u github.com/v2ray/v2ray-core \
   && rm -f $GOPATH/bin/build \
   && go install github.com/v2ray/v2ray-core/tools/build \
   && build \
+  && mv bin/v2ray-custom-linux-64/v2ray bin \
   && rm -rf pkg src
 
 EXPOSE 27183
@@ -11,4 +12,4 @@ COPY gen-server-cfg.sh /go/gen-server-cfg.sh
 COPY docker-entrypoint.sh /entrypoint.sh
 
 ENTRYPOINT ["/entrypoint.sh"]
-CMD ["/go/bin/v2ray-custom-linux-64/v2ray", "--config=/go/server-cfg.json"]
+CMD ["v2ray", "--config=/go/server-cfg.json"]

tools/docker/docker-entrypoint.sh

@@ -1,8 +1,10 @@
 #!/bin/bash
 set -e
 
-if [ ! -e "server-cfg.json" ]; then
-    ./gen-server-cfg.sh
+if [ "$1" = 'v2ray' ]; then
+  if [ ! -e "server-cfg.json" ]; then
+      ./gen-server-cfg.sh
+  fi
 fi
 
 exec "$@"