Add zizmor and fix its findings

.github/dependabot.yml

@@ -8,3 +8,15 @@ updates:
       bundler:
         patterns:
           - "*"
+    cooldown:
+      default-days: 7
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7

.github/workflows/build.yml

@@ -17,12 +17,12 @@ jobs:
       CI: 1
       USE_OFFICIAL_GEM_SOURCE: 1
     steps:
-      - uses: actions/checkout@v3
-      - uses: ruby/setup-ruby@v1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
         with:
           ruby-version: ${{ matrix.ruby }}
-      - name: Install bundler
-        run: gem install bundler
       - name: Install dependencies
         run: bundle install
       - run: bundle exec rspec

.github/workflows/push_gem.yml

@@ -22,16 +22,20 @@ jobs:
     steps:
       # Set up
       - name: Harden Runner
-        uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
+        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
         with:
           egress-policy: audit
 
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Set up Ruby
         uses: ruby/setup-ruby@2e007403fc1ec238429ecaa57af6f22f019cc135 # v1.234.0
         with:
-          bundler-cache: true
           ruby-version: ruby
+      # Not bundler-cache: a release shouldn't restore a cache other workflows can write.
+      - name: Install gems
+        run: bundle install
 
       # Release
-      - uses: rubygems/release-gem@9e85cb11501bebc2ae661c1500176316d3987059 # v1
+      - uses: rubygems/release-gem@9e85cb11501bebc2ae661c1500176316d3987059 # v1.1.0

.github/workflows/zizmor.yml

@@ -0,0 +1,16 @@
+name: GitHub Actions Security Analysis
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    permissions:
+      contents: read
+      security-events: write
+    uses: rubyatscale/shared-config/.github/workflows/zizmor.yml@main # zizmor: ignore[unpinned-uses] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically