Add HACS and hassfest validation workflows

Author: lackas

.github/workflows/hacs.yml

@@ -0,0 +1,16 @@
+name: HACS Validation
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  hacs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: hacs/action@main
+        with:
+          category: integration

.github/workflows/hassfest.yml

@@ -0,0 +1,14 @@
+name: Hassfest Validation
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  hassfest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: home-assistant/actions/hassfest@master