tentative validate stage

.gitlab-ci.yml

 default:
   image: python:latest
-  before_script:
+  before_script: &default_before
     - python -V               # Print out python version for debugging
     - python -m pip install -U pip virtualenv
     - python -m virtualenv .venv
     - source .venv/bin/activate
     - python -m pip install -U -r requirements.txt
 
+
+stages:
+  - lint
+  - build
+
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
 
@@ -22,4 +27,15 @@ split:
     expose_as: "UD standard split"
     name: "UD_Old_French-SRCMF-$CI_COMMIT_REF_NAME"
     paths:
-      - "local/UD_Old_French-SRCMF/"
\ No newline at end of file
+      - "local/UD_Old_French-SRCMF/"
+
+validate:
+  stage: "lint"
+  before_script:
+    - *default_before
+    - git clone --depth 1 https://github.com/UniversalDependencies/tools.git
+    - python -m pip install regex
+  script:
+    - python tools/validate.py --lang fro corpus/*conllu
+
+