ci: add zizmor workflow

Let's at least be aware of GitHub Actions issues.

Author: indygreg

.github/workflows/zizmor.yml

@@ -0,0 +1,22 @@
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "**" ]
+
+permissions: { }
+
+jobs:
+  zizmor:
+    name: Run zizmor 🌈
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor 🌈
+        uses: zizmorcore/zizmor-action@5ca5fc7a4779c5263a3ffa0e1f693009994446d1 # v0.1.2

.github/zizmor.yml

@@ -0,0 +1,5 @@
+rules:
+  unpinned-uses:
+    config:
+      policies:
+        "*": hash-pin