added gcp auth in build stage

.github/workflows/vertx-parent.yaml

@@ -18,6 +18,19 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Authenticate to Google Cloud
+        uses: google-github-actions/auth@v2
+        with:
+          project_id: ${{ secrets.WORKLOAD_IDENTITY_PROJECT }}
+          workload_identity_provider: ${{ secrets.WORKLOAD_IDENTITY_PROVIDER }}
+          create_credentials_file: true
+          export_environment_variables: true
+          cleanup_credentials: true
+
+      - name: Set up OAuth2 access token for Maven
+        run: |
+          echo "ACCESS_TOKEN=$(gcloud auth print-access-token)" >> $GITHUB_ENV
+
       - name: Set up JDK
         uses: actions/setup-java@v4
         with:
@@ -108,4 +121,4 @@ jobs:
       - name: Deploy Snapshots
         run: |
           echo "Deploying snapshots"
-          mvn -s $HOME/.m2/settings.xml -Dmaven.wagon.http.retryHandler.count=3 --batch-mode -e -DskipTests=true deploy
+          mvn -s $HOME/.m2/settings.xml -Dmaven.wagon.http.retryHandler.count=3 --batch-mode -e -DskipTests=true deploy