build: add CI action to use ruff

Author: laszlojakab

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+on:
+  push: 
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  linters:
+    name: Linters
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        id: setup-python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - run: pip3 install homeassistant
+      - run: pip3 install ruff
+      - run: ruff check
+      - run: ruff format