Add reusable zizmor scanning workflow

.github/workflows/zizmor.yml

@@ -0,0 +1,40 @@
+name: zizmor
+
+on:
+  workflow_call:
+
+permissions: {}
+
+jobs:
+  zizmor:
+    name: Scan GitHub Actions
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - uses: astral-sh/setup-uv@c18668ad3cf93ea998bef934396af7bb5c839dc7 # v10.2.0
+        with:
+          enable-cache: true
+          python-version: '3.13'
+
+      - name: Run zizmor
+        run: uvx --from zizmor zizmor --format=github .
+
+      - name: Generate SARIF report
+        if: always()
+        run: uvx --from zizmor zizmor --format=sarif --no-exit-codes . > zizmor.sarif
+
+      - name: Upload SARIF report
+        if: >
+          always() &&
+          (github.event_name != 'pull_request' ||
+          github.event.pull_request.head.repo.full_name == github.repository)
+        uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4
+        with:
+          sarif_file: zizmor.sarif