chore: Add maven sonar workflow

.github/workflows/sonar.yaml

@@ -6,31 +6,33 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 jobs:
-  build:
-    name: Java 11 Gradle Build
+  sonar-maven:
+    name: Java 11 Maven Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
       - name: Set up JDK 11
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v3
         with:
+          distribution: temurin
           java-version: 11
       - name: Cache SonarCloud packages
         uses: actions/cache@v3
         with:
           path: ~/.sonar/cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
-      - name: Cache Gradle packages
+      - name: Cache Maven packages
         uses: actions/cache@v3
         with:
-          path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
-          restore-keys: ${{ runner.os }}-gradle
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
       - name: Build and analyze
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        run: ./gradlew build sonarqube --info
+        run: mvn -B verify sonar:sonar -Dsonar.projectKey=googleapis_gax-java -Dsonar.organization=googleapis -Dsonar.host.url=https://sonarcloud.io -Denforcer.skip -Dclirr.skip -Dsonar.verbose=true
+