Explicitly set Linguist languages during testszj-test-ruby-linguist

Locally, tests failed when these required a Gitaly server to start, 3
tests failed as the server was unable to find the Linguist colors. This
is fixed by skipping autodetection, and overriding the default value.

Observed tests that failed:

```
rspec ./spec/gitaly/ref_service_spec.rb:11
rspec ./spec/gitaly/repository_service_spec.rb:10
rspec ./spec/gitaly/repository_service_spec.rb:16
```

Of these, now only the ref_service_spec.rb is still failing, but with a
deadline exceeded error. This seems like the server is slow to start,
somehow. Given my gut feeling says its unrelated, it will be fixed in a
later commit.

2 files changed, 11 insertions, 3 deletions

diff --git a/config.toml.example b/config.toml.example
index 0822e8ca1..b3cd6057e 100644
--- a/config.toml.example
+++ b/config.toml.example
@@ -63,6 +63,9 @@ dir = "/home/git/gitaly/ruby"
 #
 # # Number of gitaly-ruby worker processes
 # num_workers = 2
+#
+# # Override Linguist languages path
+# linguist_languages_path = ""
 
 [gitlab-shell]
 # The directory where gitlab-shell is installed
diff --git a/ruby/spec/integration_helper.rb b/ruby/spec/integration_helper.rb
index 0186d0514..b4e118ff9 100644
--- a/ruby/spec/integration_helper.rb
+++ b/ruby/spec/integration_helper.rb
@@ -18,19 +18,24 @@ end
 def start_gitaly
   build_dir = File.expand_path('../../../_build', __FILE__)
   gitlab_shell_dir = File.join(TMP_DIR, 'gitlab-shell')
+  linguist_path = File.join(
+    Bundler.rubygems.find_name('github-linguist').first.full_gem_path,
+    "lib", "linguist", "languages.json"
+  )
 
   FileUtils.mkdir_p([TMP_DIR, File.join(gitlab_shell_dir, 'hooks')])
 
   config_toml = <<~CONFIG
     socket_path = "#{SOCKET_PATH}"
     bin_dir = "#{build_dir}/bin"
-    
+
     [gitlab-shell]
     dir = "#{gitlab_shell_dir}"
-    
+
     [gitaly-ruby]
     dir = "#{build_dir}/assembly/ruby"
-    
+    linguist_languages_path = "#{linguist_path}"
+
     [[storage]]
     name = "#{DEFAULT_STORAGE_NAME}"
     path = "#{DEFAULT_STORAGE_DIR}"