Secure GitHub Actions workflows

.github/workflows/build.yml

@@ -9,6 +9,9 @@ on:
     # At 12:00 UTC on every day-of-month
     - cron: "0 12 */1 * *"
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
@@ -31,14 +34,16 @@ jobs:
           - { "py": "3.8", "tox_env": "py38" }
     steps:
       - name: setup python for tox
-        uses: actions/setup-python@v6.3.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.11"
       - name: install tox
         run: python -m pip install tox
-      - uses: actions/checkout@v7.0.0
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: setup python for test ${{ matrix.py }}
-        uses: actions/setup-python@v6.3.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: ${{ matrix.py }}-dev
       - name: setup test suite ${{ matrix.tox_env }}
@@ -50,9 +55,11 @@ jobs:
     name: check docs
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v7.0.0
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: setup Python 3.14
-        uses: actions/setup-python@v6.3.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.14"
       - name: install tox
@@ -66,14 +73,14 @@ jobs:
     name: lint
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v7.0.0
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       # mypy needs to be run with the oldest Python version we support.
       - name: setup Python 3.8
-        uses: actions/setup-python@v6.3.0
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: "3.8"
-      - name: Install prettier
-        run: npm install -g prettier
       - name: install tox
         run: python -m pip install tox
       - name: install lint dependencies

.github/workflows/build_dist.yml

@@ -10,6 +10,9 @@ on:
     # At 12:00 UTC on every day-of-month
     - cron: "0 12 */1 * *"
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
@@ -19,12 +22,14 @@ jobs:
     name: Source and wheel distributions
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7.0.0
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
 
       - name: Build distributions
         run: pipx run build[virtualenv] --sdist --wheel
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           path: dist/*
 
@@ -35,9 +40,9 @@ jobs:
     permissions:
       id-token: write # Required to retrieve a Trusted Publishing token
     steps:
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           name: artifact
           path: dist
 
-      - uses: pypa/gh-action-pypi-publish@v1.14.0
+      - uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0

.github/workflows/zizmor.yml

@@ -0,0 +1,25 @@
+name: GitHub Actions Security Analysis with zizmor
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    name: Run zizmor
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@192e21d79ab29983730a13d1382995c2307fbcaa # v0.5.7