Update seq-forwarder-build.yml with docker buildx

Author: ricardomlc117

.github/workflows/seq-forwarder-build.yml

@@ -31,6 +31,9 @@ jobs:
           username: ${{ secrets.ACR_USERNAME }}
           password: ${{ secrets.ACR_PASSWORD }}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        
       - name: Build and Push to ACR
         uses: docker/build-push-action@v2
         with: