improve GitHubworkflows by introducing zizmor for monitoring (#2686)

* fix(workflows): fetch-depth is for actions/checkout

* chore(workflows): update

- pin all actions to precise commits
- avoid credential leakage from actions/checkout
- group action updates going forward
- add zimor config to ignore "secrets outside env"
- add job to keep validating workflows

Author: till

.github/dependabot.yml

@@ -4,3 +4,9 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      action-deps:
+        patterns:
+          - "*"

.github/workflows/main.yml

@@ -15,10 +15,12 @@ jobs:
   prettier:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 2
+          persist-credentials: false
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
+        with:
           node-version: "lts/*"
           cache: "npm"
       - name: Install dependencies
@@ -34,10 +36,12 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 2
+          persist-credentials: false
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
+        with:
           node-version: "lts/*"
           cache: "npm"
       - name: Install dependencies
@@ -52,10 +56,12 @@ jobs:
   browser-test:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 2
+          persist-credentials: false
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
+        with:
           node-version: "lts/*"
           cache: "npm"
       - name: Install dependencies
@@ -82,10 +88,12 @@ jobs:
     if: ${{ github.ref == 'refs/heads/main' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 2
+          persist-credentials: false
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
+        with:
           node-version: "lts/*"
           cache: "npm"
       - name: Install dependencies
@@ -109,11 +117,13 @@ jobs:
         node-version: [20, 22, 24]
 
     steps:
-      - uses: actions/checkout@v6
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 2
+          persist-credentials: false
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
+        with:
           node-version: ${{ matrix.node-version }}
           cache: "npm"
       - name: Install dependencies
@@ -123,3 +133,15 @@ jobs:
           PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: 1
       - name: npm test
         run: npm run test-node
+
+  validate-workflows:
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: zizmorcore/zizmor-action@71321a20a9ded102f6e9ce5718a2fcec2c4f70d8 # v0.5.2

.github/zizmor.yml

@@ -0,0 +1,3 @@
+rules:
+  secrets-outside-env:
+    disable: true