Add hassfest workflow

Author: koosoli

.github/workflows/hassfest.yaml

@@ -0,0 +1,20 @@
+name: Hassfest
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  hassfest:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Run hassfest
+        uses: home-assistant/actions/hassfest@master