Add SonarQube workflow and test file

.gitea/workflows/sonarqube.yaml

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+name: SonarQube Analysis
+
+on:
+  push:
+    branches: [main, master, develop]
+  pull_request:
+
+jobs:
+  sonarqube:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          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 }}

app.js

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+// Test file for SonarQube analysis
+function greet(name) {
+    if (name == null) {  // Bug: should use === for strict comparison
+        return "Hello, World!";
+    }
+    return "Hello, " + name + "!";
+}
+
+// Code smell: unused variable
+var unusedVar = 42;
+
+// Security hotspot: hardcoded password
+const password = "admin123";
+
+console.log(greet("SonarQube"));

sonar-project.properties

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+sonar.projectKey=test-sonarqube
+sonar.projectName=Test SonarQube
+sonar.sources=.
+sonar.exclusions=**/.gitea/**