Fix Claude fix CI workflow checking for attempts count

Author: ondrejmirtes

.github/workflows/claude-fix-pr-ci.yml

@@ -45,9 +45,9 @@ jobs:
         id: check-attempts
         env:
           GH_TOKEN: ${{ secrets.PHPSTAN_BOT_TOKEN }}
-          HEAD_BRANCH: ${{ github.head_ref }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
         run: |
-          COMMITS=$(gh api "repos/${{ github.repository }}/commits?sha=$HEAD_BRANCH&per_page=50" \
+          COMMITS=$(gh api "repos/${{ github.repository }}/pulls/$PR_NUMBER/commits?per_page=100" \
             --jq '[.[] | select(.commit.message | test("\\[claude-ci-fix\\]"))] | length')
 
           if [ "$COMMITS" -ge 2 ]; then