Added examples testing to CI

.gitlab-ci.yml

@@ -1,9 +1,15 @@
 image: gcc
 
 stages:
+  - dependencies
   - build
   - test
 
+packages:
+  stage: dependencies
+  script:
+    - dpkg-query -Wf'${db:Status-abbrev}' python3
+
 build:
   stage: build
   script:
@@ -17,3 +23,8 @@ unit-testing:
   stage: test
   script:
     - make unit-tests
+
+examples_testing:
+  stage: test
+  script:
+    - etc/tools/test.py examples