Better variable name

.gitlab-ci.yml

 image: "ruby:2.3"
 
 before_script:
-  - export PATH=~/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
+  - export PATH=~/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin
   - apt update
   - apt install rsync -y
   - gem install --bindir /usr/local/bin bundler
@@ -43,3 +43,12 @@ rspec:ruby2.1:
     - ruby
   except:
     - tags
+
+compile:
+  # Image taken from gitlab-ce@59f81b4ff8
+  image: "dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.3.3-golang-1.8-git-2.7-phantomjs-2.1-node-7.1"
+  script:
+    - go version
+    - which go
+    - bin/compile
+

bin/compile

@@ -6,20 +6,20 @@ require 'fileutils'
 require_relative '../lib/gitlab_init'
 
 GO_DIR = 'go'
-GOPATH = File.join(ROOT_PATH, 'go_build')
+BUILD_DIR = File.join(ROOT_PATH, 'go_build')
 GO_PACKAGE = File.join('gitlab.com/gitlab-org/gitlab-shell', GO_DIR)
 
 def main
-  FileUtils.rm_rf(GOPATH)
-  build_source_dir = File.join(GOPATH, 'src', GO_PACKAGE)
+  FileUtils.rm_rf(BUILD_DIR)
+  build_source_dir = File.join(BUILD_DIR, 'src', GO_PACKAGE)
   FileUtils.mkdir_p(build_source_dir)
   FileUtils.cp_r(File.join(ROOT_PATH, GO_DIR, '.'), build_source_dir)
   env = {
-    'GOPATH' => GOPATH,
+    'GOPATH' => BUILD_DIR,
     'GO15VENDOREXPERIMENT' => '1',
   }
   run!(env, %W[go install #{GO_PACKAGE}/cmd/...])
-  executables = Dir[File.join(GOPATH, 'bin', '*')]
+  executables = Dir[File.join(BUILD_DIR, 'bin', '*')]
   FileUtils.chmod(0755, executables)
   FileUtils.cp(executables, File.join(ROOT_PATH, 'bin'))
 end