move size determination to after commit

.github/workflows/update-test-runtime-statistics.yml

@@ -31,14 +31,15 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.PAT }}
         run: |
+          git config user.name "GitHub Actions Bot"
+          git config user.email "<[email protected]>"
+          git commit -m "chore(ci): updated test file runtime file" .ci/runtimes.json
+
           FIRST_LINE=$(git diff-tree -r -c -M -C --no-commit-id HEAD | head -n 1)
           BLOB_HASH=$(echo $FIRST_LINE | awk '{print $4}')
           SIZE=$(echo $BLOB_HASH | git cat-file --batch-check | grep "blob" | awk '{ print $3 }')
           PRINTABLE_SIZE=$(numfmt --to=iec --suffix=B --format="%.1f" "$SIZE")
 
-          git config user.name "GitHub Actions Bot"
-          git config user.email "<[email protected]>"
-          git commit -m "chore(ci): updated test file runtime file" .ci/runtimes.json
           git push -f origin HEAD:chore/update-runtimes
           gh pr create --title "chore(ci): update test runtimes" \
                        --body "This PR updates the test runtimes file to incorporate latest statistics for better scheduling.  It increases the repository size by $PRINTABLE_SIZE" \