only update on changes

.github/workflows/update-swiftlint.yml

@@ -37,7 +37,20 @@ jobs:
  checksum=${{ steps.fetch_details.outputs.checksum }}
  sed -i 's|url: "https://github.com/realm/SwiftLint/releases/download/.*"|url: "'"${binary_url}"'"|' Package.swift
  sed -i 's|checksum: ".*"|checksum: "'"${checksum}"'"|' Package.swift
- - name: Commit changes
+
+ - name: Check for changes
+ id: check_changes
+ run: |
+ if git diff --quiet; then
+ echo "No changes detected"
+ echo "::set-output name=changes_detected::false"
+ else
+ echo "Changes detected"
+ echo "::set-output name=changes_detected::true"
+ fi
+
+ - name: Commit and push changes
+ if: steps.check_changes.outputs.changes_detected == 'true'
  run: |
  git config --global user.name 'github-actions[bot]'
  git config --global user.email 'github-actions[bot]@users.noreply.github.com'