Add sonarcloud workflow

.github/workflows/sonarcloud.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: SonarCloud check
+jobs:
+  sonarcloud:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # Disabling shallow clone is recommended for improving relevancy of reporting
+          fetch-depth: 0
+      - name: SonarCloud Scan
+        uses: sonarsource/[email protected] # Ex: v2.1.0, See the latest version at https://github.com/marketplace/actions/sonarcloud-scan
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_ORG_KEY: ${{ secrets.SONAR_ORG_KEY }}

sonar-project.properties

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+# This is the name and version displayed in the SonarCloud UI.
+sonar.projectKey=swift-testing_blueapi-test
+sonar.organization=swift-testing
+
+sonar.projectName=blueapi-test
+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
+# relative paths to source directories. More details and properties are described
+# in https://sonarcloud.io/documentation/project-administration/narrowing-the-focus/
+sonar.sources=src
+
+# python settings
+sonar.python.version=3.10
+sonar.python.coverage.reportPaths=coverage.xml