.gitlab-ci.yml: add sonarqube-check part

.gitlab-ci.yml

@@ -18,3 +18,24 @@ tests:
     - pip install biopython==1.75
   script:
     - coverage run -m unittest discover
+
+sonarqube-check:
+  image:
+    name: sonarsource/sonar-scanner-cli:latest
+    entrypoint: [ "" ]
+  variables:
+    SONAR_TOKEN: ae2c1731888a2155e90ea0a1dcec551c8d4336bd
+    SONAR_HOST_URL: http://localhost:9000/
+    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar"  # Defines the location of the analysis task cache
+    GIT_DEPTH: "0"  # Tells git to fetch all the branches of the project, required by the analysis task
+  cache:
+    key: "${CI_JOB_NAME}"
+    paths:
+      - .sonar/cache
+  script:
+    - sonar-scanner -Dsonar.qualitygate.wait=true
+  allow_failure: true
+  only:
+    - merge_requests
+    - master
+    - develop