language support

docker/Dockerfile

@@ -7,3 +7,4 @@ RUN apt-get -y install python
 RUN apt-get -y install python3
 RUN apt-get -y install ruby
 RUN apt-get -y install nodejs
+RUN apt-get -y install golang

docker/execute

@@ -29,10 +29,10 @@ case "$lang" in
     bin=executor_python3
     ;;
 "ruby")
-    bin=ruby
+    bin=executor_ruby
     ;;
 "javascript" | "js" | "node")
-    bin=nodejs
+    bin=executor_node
     ;;
 "c")
     bin=executor_c
@@ -40,6 +40,9 @@ case "$lang" in
 "cpp" | "c++")
     bin=executor_cpp
     ;;
+"go")
+    bin=executor_go
+    ;;
 *)
     echo "invalid language"
     exit

docker/executors/go

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+go run $*

docker/executors/node

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+nodejs $*

docker/executors/ruby

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+ruby $*