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/cd.yml

@@ -1,6 +1,6 @@
 name: CD
 
-on:
+on: # zizmor: ignore[dangerous-triggers] deploy-after-CI-passes is the standard rubyatscale release pattern; the called workflow only tags/publishes on main
   workflow_run:
     workflows: [CI]
     types: [completed]
@@ -10,5 +10,5 @@ jobs:
   call-workflow-from-shared-config:
     permissions:
       contents: write
-    uses: rubyatscale/shared-config/.github/workflows/cd.yml@main
+    uses: rubyatscale/shared-config/.github/workflows/cd.yml@main # zizmor: ignore[unpinned-uses,secrets-inherit] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically; environments are managed by callers
     secrets: inherit

.github/workflows/ci.yml

@@ -11,5 +11,5 @@ permissions:
 
 jobs:
   call-workflow-from-shared-config:
-    uses: rubyatscale/shared-config/.github/workflows/ci.yml@main
+    uses: rubyatscale/shared-config/.github/workflows/ci.yml@main # zizmor: ignore[unpinned-uses,secrets-inherit] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically; its ci.yml reads SLACK_WEBHOOK_URL but declares no workflow_call secrets, so inherit is the only way to pass it
     secrets: inherit

.github/workflows/stale.yml

@@ -8,4 +8,4 @@ jobs:
     permissions:
       issues: write
       pull-requests: write
-    uses: rubyatscale/shared-config/.github/workflows/stale.yml@main
+    uses: rubyatscale/shared-config/.github/workflows/stale.yml@main # zizmor: ignore[unpinned-uses] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically

.github/workflows/triage.yml

@@ -8,4 +8,4 @@ jobs:
   call-workflow-from-shared-config:
     permissions:
       issues: write
-    uses: rubyatscale/shared-config/.github/workflows/triage.yml@main
+    uses: rubyatscale/shared-config/.github/workflows/triage.yml@main # zizmor: ignore[unpinned-uses] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically

.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