fix: streamline initial CHANGELOG.md creation process

Author: laysakura

.github/workflows/publish.yml

@@ -355,25 +355,23 @@ jobs:
       - name: Create initial CHANGELOG.md if not exists
         if: steps.check-changelog.outputs.exists == 'false'
         run: |
-          cat > CHANGELOG.md << 'EOF'
-# Changelog
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
-### Added
-
-### Changed
-
-### Fixed
-
-### Removed
-
-EOF
+          echo "# Changelog" > CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "All notable changes to this project will be documented in this file." >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)," >> CHANGELOG.md
+          echo "and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)." >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "## [Unreleased]" >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "### Added" >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "### Changed" >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "### Fixed" >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
+          echo "### Removed" >> CHANGELOG.md
+          echo "" >> CHANGELOG.md
 
       - name: Update CHANGELOG.md
         id: update-changelog