.gitlab-ci.yml: set locale to UTF-8

.gitlab-ci.yml

@@ -3,6 +3,12 @@ stages:
  - unit
  - demo
 
+
+before_script:
+ - echo "LANG=\"en_US.UTF-8\"" >> /etc/default/locale
+ - locale-gen en_US.UTF-8
+ - update-locale LANG=en_US.UTF-8
+
 unit:
   stage: unit
   script: python3 -m doctest src/should.py