fix: use mvn sonar:sonar instead of standalone sonar-scanner

The standalone sonar-scanner CLI has Java discovery issues in the
build container. Switch to the Maven sonar plugin (same approach
as cameleer3 agent repo), which uses Maven's own JDK. This also
removes the sonar-scanner download/install step entirely.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/sonarqube.yml

@@ -57,41 +57,15 @@ jobs:
         working-directory: ui
         run: npm run lint -- --format json --output-file eslint-report.json || true
 
-      - name: Install sonar-scanner
-        run: |
-          SONAR_SCANNER_VERSION=6.2.1.4610
-          ARCH=$(uname -m)
-          case "$ARCH" in
-            aarch64|arm64) PLATFORM="linux-aarch64" ;;
-            *)             PLATFORM="linux-x64" ;;
-          esac
-          curl -sSLo sonar-scanner.zip "https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-${SONAR_SCANNER_VERSION}-${PLATFORM}.zip"
-          jar xf sonar-scanner.zip
-          chmod +x "sonar-scanner-${SONAR_SCANNER_VERSION}-${PLATFORM}/bin/sonar-scanner"
-          ln -s "$(pwd)/sonar-scanner-${SONAR_SCANNER_VERSION}-${PLATFORM}/bin/sonar-scanner" /usr/local/bin/sonar-scanner
-
       - name: SonarQube Analysis
         run: |
-          # sonar-scanner 6.x uses SONAR_SCANNER_JAVA_HOME (not JAVA_HOME)
-          if [ -z "$JAVA_HOME" ]; then
-            JAR_PATH=$(readlink -f $(which jar) 2>/dev/null || find / -name jar -type f 2>/dev/null | head -1)
-            export JAVA_HOME=$(dirname $(dirname "$JAR_PATH"))
-          fi
-          export SONAR_SCANNER_JAVA_HOME="$JAVA_HOME"
-          export PATH="$JAVA_HOME/bin:$PATH"
-          sonar-scanner \
-            -Dsonar.host.url="$SONAR_HOST_URL" \
-            -Dsonar.token="$SONAR_TOKEN" \
+          mvn sonar:sonar --batch-mode \
+            -Dsonar.host.url=${{ secrets.SONAR_HOST_URL }} \
+            -Dsonar.token=${{ secrets.SONAR_TOKEN }} \
             -Dsonar.projectKey=cameleer3-server \
             -Dsonar.projectName="Cameleer3 Server" \
             -Dsonar.sources=cameleer3-server-core/src/main/java,cameleer3-server-app/src/main/java,ui/src \
             -Dsonar.tests=cameleer3-server-core/src/test/java,cameleer3-server-app/src/test/java \
-            -Dsonar.java.binaries=cameleer3-server-core/target/classes,cameleer3-server-app/target/classes \
-            -Dsonar.java.test.binaries=cameleer3-server-core/target/test-classes,cameleer3-server-app/target/test-classes \
-            -Dsonar.java.libraries="$HOME/.m2/repository/**/*.jar" \
             -Dsonar.typescript.eslint.reportPaths=ui/eslint-report.json \
             -Dsonar.eslint.reportPaths=ui/eslint-report.json \
             -Dsonar.exclusions="ui/node_modules/**,ui/dist/**,**/target/**"
-        env:
-          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}