test: Add test for ruff format for cognee code

Test if code is formatted for cognee

Test COG-650

.github/workflows/ruff_format.yaml

@@ -0,0 +1,11 @@
+name: Ruff
+on: [ push, pull_request ]
+
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v2
+        with:
+          args: "format --check"