Check jinja templates for syntax error (#10667)

Allow to fail early (pre-commit time) for jinja error, rather than
waiting until executing the playbook and the invalid template.

I could not find a simple jinja pre-commit hook in the wild.

.gitlab-ci/lint.yml

@@ -27,6 +27,14 @@ ansible-lint:
     - ansible-lint -v
   except: ['triggers', 'master']
 
+jinja-syntax-check:
+  extends: .job
+  stage: unit-tests
+  tags: [light]
+  script:
+    - "find -name '*.j2' -exec tests/scripts/check-templates.py {} +"
+  except: ['triggers', 'master']
+
 syntax-check:
   extends: .job
   stage: unit-tests