Add sonar scanner

.gitlab-ci.yml

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+---
+stages:
+  - scan
+
+sonar_scan:
+  stage: scan
+  image: registry.ivayloivanov.eu/infstrct/dockerfiles/amd64/sonar-scanner-base
+  script:
+    - $HOME/sonar-scanner/bin/sonar-scanner -Dsonar.login=$SONAR_TOKEN

sonar-project.properties

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+#----- Default SonarQube server
+sonar.host.url=http://192.168.3.2:9000
+
+# must be unique in a given SonarQube instance
+sonar.projectKey=tuwien:unix
+
+# defaults to project key
+sonar.projectName=tuwien:unix
+# defaults to 'not provided'
+sonar.projectVersion=1.0.0
+
+# Path is relative to the sonar-project.properties file. Defaults to .
+sonar.sources=.
+
+# Encoding of the source code. Default is default system encoding
+sonar.sourceEncoding=UTF-8