refactor: harden tests

.github/workflows/spellcheck.yml

@@ -5,6 +5,12 @@ permissions:
 
 on:
   workflow_call:
+    inputs:
+      checkout_ref:
+        description: Optional commit to check out instead of the triggering ref
+        required: false
+        type: string
+        default: ""
   push:
     branches: ["main"]
   pull_request:
@@ -22,5 +28,7 @@ jobs:
     steps:
       - name: Checkout Actions Repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 #v7.0.0
+        with:
+          ref: ${{ inputs.checkout_ref }}
       - name: Spell Check Repo
         uses: crate-ci/typos@bee27e3a4fd1ea2111cf90ab89cd076c870fce14 #v1.48.0