Add Dependabot cooldowns and zizmor checks

Author: andrew

.github/dependabot.yml

@@ -4,7 +4,11 @@ updates:
     directory: /
     schedule:
       interval: weekly
+    cooldown:
+      default-days: 7
   - package-ecosystem: github-actions
     directory: /
     schedule:
       interval: weekly
+    cooldown:
+      default-days: 7

.github/workflows/zizmor.yml

@@ -0,0 +1,31 @@
+name: Zizmor
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/**'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '.github/**'
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@cc914d7f3750a2d13d75c7f184a1060aa0e9d482 # v0.6.4