setup CI based sonarcloud analysis

Author: lstreckeisen

.github/workflows/sonar.yml

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+name: SonarCloud Analysis
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  sonarqube:
+    name: SonarQube
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: SonarQube Scan
+        uses: SonarSource/sonarqube-scan-action@v5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

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+sonar.projectKey=lstreckeisen_context-mapper-language-server
+sonar.organization=lstreckeisen
+
+
+# This is the name and version displayed in the SonarCloud UI.
+#sonar.projectName=context-mapper-language-server
+#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