feat(scripts): add CI utilities for versioning and changelog

- Add scripts to detect version changes and generate changelogs
- Include setup for installing and configuring git-cliff
- Automate release creation and changelog updates for CI workflows
- Improve Git author setup for consistent commits

scripts/generate-unreleased-changelog.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CHANGELOG_FILE="CHANGELOG.md"
+CLIFF_CONFIG="cliff.toml"
+GIT_BRANCH="${GITHUB_REF##refs/heads/}"
+
+# === Step 1: Generate Changelog (only if file exists or on main) ===
+if [[ -f "$CHANGELOG_FILE" || "$GIT_BRANCH" == "main" ]]; then
+  echo "📄 Generating $CHANGELOG_FILE using git-cliff..."
+  git-cliff -c "$CLIFF_CONFIG" -o "$CHANGELOG_FILE"
+else
+  echo "ℹ️  $CHANGELOG_FILE does not exist and branch is not 'main'. Skipping generation."
+  exit 0
+fi
+
+# === Step 2: Commit and push changes if any ===
+git add "$CHANGELOG_FILE"
+
+if git diff --cached --quiet; then
+  echo "✅ No changes to commit – changelog is up to date."
+else
+  echo "✍️  Committing updated $CHANGELOG_FILE..."
+  git commit -m "chore(changelog): update unreleased changelog"
+  echo "🚀 Pushing to origin/$GIT_BRANCH..."
+  git push origin "$GIT_BRANCH"
+fi