Add SonarQube Scanning (#12)

* Add SonarQube scanning

* Add sonar project properties file

.github/workflows/sonarqube.yml

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+on:
+  # Trigger analysis when pushing in main or pull requests, and when creating
+  # a pull request. 
+  push:
+    branches:
+      - main
+  pull_request:
+      types: [opened, synchronize, reopened]
+
+name: SonarQube Scan
+jobs:
+  sonarqube:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        # Disabling shallow clone is recommended for improving relevancy of reporting
+        fetch-depth: 0
+    - name: SonarQube Scan
+      uses: sonarsource/sonarqube-scan-action@master
+      env:
+        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}

sonar-project.properties

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+sonar.projectKey=site-deploy
+# relative paths to source directories. More details and properties are described
+# in https://docs.sonarqube.org/latest/project-administration/narrowing-the-focus/ 
+sonar.sources=.