add locale for elixir, fix test for kotlin, add instructions for bf installation

lxc/executors/elixir

@@ -1,4 +1,6 @@
 #!/bin/bash
 
+export LC_ALL="en_US.UTF-8"
+
 cd /tmp/$2
 timeout -s KILL 3 xargs -a args.args -d '\n' elixir code.code < stdin.stdin

lxc/tests/test.kt

@@ -1,3 +1,3 @@
-fun main(args: Array<String>) {
+fun main() {
     println("good")
 }

var/install.txt

@@ -215,6 +215,14 @@ echo 'export DENO_INSTALL="/opt/.deno"' >> /opt/.profile
 echo 'export PATH="$DENO_INSTALL/bin:$PATH"' >> /opt/.profile
 source /opt/.profile
 
+# install brainfuck
+cd /opt && mkdir bf && cd bf
+git clone https://github.com/texus/Brainfuck-interpreter
+cd Brainfuck-interpreter
+echo 'export PATH=$PATH:/opt/bf/Brainfuck-interpreter' >> /opt/.profile
+source /opt/.profile
+
+
 # create runnable users and apply limits
 for i in {1..150}; do
     useradd -M runner$i