feat: add HACS and hassfest CI validation

.github/workflows/validate.yml

@@ -0,0 +1,29 @@
+name: Validate
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions: {}
+
+jobs:
+  hassfest:
+    name: Hassfest validation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: home-assistant/actions/hassfest@master
+
+  hacs:
+    name: HACS validation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: hacs/action@main
+        with:
+          category: integration
+          ignore: brands

hacs.json

@@ -0,0 +1,5 @@
+{
+  "name": "DKN Cloud NA",
+  "homeassistant": "2024.1.0",
+  "hacs": "2.0.0"
+}