Add Sonarcloud analysis

.github/workflows/sonarcloud.yaml

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+name: Sonarcloud Analysis
+on:
+  push:
+    branches:
+      - main
+jobs:
+  sonarcloud:
+    name: SonarCloud
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarcloud-github-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

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+sonar.projectKey=k8ssandra_k8ssandra
+sonar.organization=k8ssandra
+
+# This is the name and version displayed in the SonarCloud UI.
+#sonar.projectName=k8ssandra
+#sonar.projectVersion=1.0
+
+# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
+#sonar.sources=.
+
+# Encoding of the source code. Default is default system encoding
+#sonar.sourceEncoding=UTF-8