Add zizmor for GitHub Actions security scanning

.github/workflows/test.yml

@@ -9,7 +9,8 @@ on:
     types: [checks_requested]
   workflow_dispatch:
 
-permissions: read-all
+permissions:
+  contents: read
 
 env:
   CARGO_TERM_COLOR: always
@@ -27,6 +28,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: Install cargo-deny
         uses: EmbarkStudios/cargo-deny-action@v2
@@ -39,6 +42,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
@@ -69,6 +74,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
@@ -104,6 +111,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: Install additional shells
         if: startsWith(matrix.runs-on, 'ubuntu')
@@ -155,6 +164,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v6
+        with:
+          persist-credentials: false
 
       - name: Download rv binary
         uses: actions/download-artifact@v5

.github/workflows/zizmor.yml

@@ -0,0 +1,25 @@
+name: GitHub Actions security
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@v0.5.0

.github/zizmor.yml

@@ -0,0 +1,14 @@
+rules:
+  unpinned-uses:
+    # TODO: pin all action references to commit SHAs
+    disable: true
+
+  template-injection:
+    ignore:
+      # release.yml is autogenerated by cargo-dist
+      - release.yml
+
+  excessive-permissions:
+    ignore:
+      # release.yml is autogenerated by cargo-dist and requires contents:write
+      - release.yml