CI pipeline for mysql unit tests

Summary

The pipeline should also run the tests with a MySQL as backend server. This MR implements this.

See also #33 (closed).

Focus

• Does the MySQL pipeline fail at the expected point?
• Is outsourcing pipeline code to a Makefile a reasonable step to prevent redundancy in the scripts?

Test Environment

Just watch the pipeline run.

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

.gitlab-ci.yml

@@ -59,6+59,6 @@
 
 # Run the unit tests
 unittests:
   tags: [ docker ]
   stage: test
   script:
     - cp config.defaults .config
     - echo 'DATABASE_USER_HOST_LIST="%,"' >> .config
     - echo "MYSQL_USER_PASSWORD=$MYSQL_ROOT_PASSWORD" >> .config
-    - echo "MYSQL_HOST=mysql" >> .config
+    - echo "MYSQL_HOST=localhost" >> .config
     - sleep 10
     - cat .config
     - make install