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/read-cliff-version.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CLIFF_TOML="${1:-cliff.toml}"
+
+if [[ ! -f "$CLIFF_TOML" ]]; then
+  echo "❌ File not found: $CLIFF_TOML" >&2
+  echo "version=" >> "$GITHUB_OUTPUT"
+  exit 0
+fi
+
+VERSION_LINE=$(awk -F '=' '/^# CLIFF_VERSION=/ { gsub(/[" ]/, "", $2); print $2 }' "$CLIFF_TOML" || true)
+
+if [[ -n "$VERSION_LINE" ]]; then
+  echo "✅ Extracted CLIFF_VERSION: $VERSION_LINE"
+else
+  echo "⚠️  No CLIFF_VERSION found in $CLIFF_TOML"
+fi
+
+# Output für GitHub Actions / Composite Action
+echo "version=${VERSION_LINE:-}" >> "$GITHUB_OUTPUT"