add sonarqube

.gitlab-ci.yml

+---
+image:
+  name: sonarsource/sonar-scanner-cli:${SONAR_SCANNER_CLI_VERSION}
+stages:
+  - sonarqube
+test:
+  stage: sonarqube
+  variables:
+    SONAR_PROJECT_BASE_DIR: "$CI_PROJECT_DIR"
+  script:
+    - /usr/bin/entrypoint.sh sonar-scanner -Dsonar.projectKey="$CI_PROJECT_NAME"  # sonar.projectKey defines the name of the project in SonarQube. In this example it uses the same name of the project in Gitlab.
+  tags:  # NOT to be confused with git tags. This is GitLab tag
+    - sonarqube