ci: Use branch name instead of ref

Author: lewisjared

.github/workflows/pr-comment.yaml

@@ -41,9 +41,11 @@ jobs:
           PR_NUMBER: ${{ github.event.issue.number }}
           NODE_ID: ${{ github.event.comment.node_id }}
 
-      - name: Get PR HEAD Ref
-        id: getRef
-        run: echo "pr_ref=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json headRefOid | jq -r '.headRefOid')" >> $GITHUB_OUTPUT
+      - name: Get PR HEAD branch
+        id: getBranch
+        # This gets the PR's head ref name (aka branch)
+        # We can't use the SHA or the default because of how this workflow is triggered
+        run: echo "pr_branch=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json headRefName | jq -r '.headRefName')" >> $GITHUB_OUTPUT
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           PR_NUMBER: ${{ github.event.issue.number }}
@@ -52,7 +54,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: ${{ steps.getRef.outputs.pr_ref }}
+          ref: ${{ steps.getBranch.outputs.pr_branch }}
           token: ${{ secrets.PAT }}
 
       - name: Run the regeneration