added hacs workflows

.github/workflows/hassfest_validation.yml

@@ -0,0 +1,16 @@
+name: Validate with hassfest
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  validate:
+    runs-on: "ubuntu-latest"
+    steps:
+        - uses: "actions/checkout@v3"
+        - uses: "home-assistant/actions/hassfest@master"