Harden GitHub workflows

.github/dependabot.yml

@@ -4,13 +4,17 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
-    # Too noisy. See https://github.community/t/increase-if-necessary-for-github-actions-in-dependabot/179581
-    open-pull-requests-limit: 0
+      interval: "weekly"
+    cooldown:
+      default-days: 7
+    ignore:
+      - dependency-name: "yiisoft/*"
 
   # Maintain dependencies for Composer
   - package-ecosystem: "composer"
     directory: "/"
     schedule:
       interval: "daily"
+    cooldown:
+      default-days: 7
     versioning-strategy: increase-if-necessary

.github/workflows/bc.yml_

@@ -15,7 +15,7 @@ permissions:
 
 jobs:
   roave_bc_check:
-    uses: yiisoft/actions/.github/workflows/bc.yml@master
+    uses: yiisoft/actions/.github/workflows/bc.yml@ab62d6b3b0e0cff6c9724ec5a395bedb41c639a2
     with:
       php: >-
         ['8.1']

.github/workflows/zizmor.yml

@@ -0,0 +1,22 @@
+name: GitHub Actions Security Analysis with zizmor 🌈
+
+on:
+  push:
+    branches:
+      - master
+      - main
+    paths:
+      - '.github/**.yml'
+      - '.github/**.yaml'
+  pull_request:
+    paths:
+      - '.github/**.yml'
+      - '.github/**.yaml'
+
+permissions:
+  actions: read # Required by zizmor when reading workflow metadata through the API.
+  contents: read # Required to read workflow files.
+
+jobs:
+  zizmor:
+    uses: yiisoft/actions/.github/workflows/zizmor.yml@master