Add Docker Buildx setup to CI workflow

Added Docker Buildx setup step to CI workflow.

Author: Santhosh-p653

.github/workflows/ci-agents.yml

@@ -92,6 +92,9 @@ jobs:
             type=sha,prefix=sha-
             type=raw,value=latest,enable={{is_default_branch}}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build and push Agents Docker image
         uses: docker/build-push-action@v5
         with: