fix: debug failure writing to GITHUB_OUTPUT

Add some debug statements

action.yml

@@ -99,13 +99,19 @@ runs:
         echo "GITHUB_OUTPUT=$GITHUB_OUTPUT"
         ls -l "$GITHUB_OUTPUT"
         echo "pr-number=$pr_number" >> "$GITHUB_OUTPUT"
+    # - name: Test that PR number is retrieveable
+    #   if: inputs.comment-on-pr == 'true' && steps.pr-number.outputs.pr-number != ''
+    #   env:
+    #     PR_ID: ${{ steps.pr-number.outputs.pr-number }}
+    #   run: |
+    #     echo PR_ID="$PR_ID"
     - name: Find previous comment (if present)
       # We want to generate a comment, and we we able to fin the PR number
       if: inputs.comment-on-pr == 'true' && steps.pr-number.outputs.pr-number != ''
       id: find-comment
       uses: https://github.com/peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3
       with:
-        issue-number: steps.pr-number.outputs.pr-number
+        issue-number: ${{ steps.pr-number.outputs.pr-number }}
         direction: first
         body-includes: "<!-- AUTOGENERATED by nix-flake-outputs-size action -->"
     - name: Create report