ci: add zizmor GHA workflow

.github/workflows/zizmor.yaml

@@ -0,0 +1,36 @@
+name: GitHub Actions Security Analysis with zizmor
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  zizmor:
+    name: zizmor latest via PyPI
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      # required for workflows in private repositories
+      contents: read
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Run zizmor 🌈
+        run: uvx zizmor --format sarif . > results.sarif
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: results.sarif
+          category: zizmor

zizmor.yml

@@ -1,4 +1,7 @@
 rules:
   cache-poisoning:
     ignore:
+      # ci.yaml runs goreleaser in snapshot mode to test the build process but does not
+      # push a new release. However, zizmor uses the presence of goreleaser to assume
+      # a workflow publishes releases and then enables its cache-poisoning rule.
       - ci.yaml