Merge branch 'pedropombeiro/add-rb-line-limit-length-to-editorconfig' into 'master'

Formalise Ruby line limit to .editorconfig

See merge request gitlab-org/gitlab!84925

.editorconfig

@@ -16,3 +16,6 @@ charset = utf-8
 
 [*.{md,markdown,js.snap}]
 trim_trailing_whitespace = false
+
+[*.rb]
+max_line_length = 120