ci: re-add HACS and hassfest workflows

Author: Johann

.github/workflows/hassfest.yml

@@ -0,0 +1,12 @@
+name: Hassfest
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: home-assistant/actions/hassfest@master

.github/workflows/validate.yml

@@ -0,0 +1,14 @@
+name: Validate
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: hacs/action@main
+        with:
+          category: integration