Add SonarQube scan workflow with security-hardened permissions

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - maintree/main
+
+
+jobs:
+  build:
+    name: Build and analyze
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - uses: SonarSource/sonarqube-scan-action@v5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+      # If you wish to fail your job when the Quality Gate is red, uncomment the
+      # following lines. This would typically be used to fail a deployment.
+      # - uses: SonarSource/sonarqube-quality-gate-action@v1
+      #   timeout-minutes: 5
+      #   env:
+      #     SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}