Update ci.yaml

.github/workflows/ci.yaml

@@ -49,10 +49,3 @@ jobs:
           cargo install --force duckscript_cli
           cargo make flowy_dev
           cargo make -p development-linux-x86 appflowy-linux-dev
-  build-backend:
-    runs-on: macOS-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Run backend tests
-        run: cd backend && cargo test