feat(run): add version flag and enforce as required input

- Add a `--version` flag to the script for specifying the version
- Enforce `--version` as a required input with validation
- Update cloning logic to use the `--version` flag for branch selection

run.sh

@@ -9,7 +9,8 @@
 #      via the action’s generator script.
 #
 # Usage:
-#   ./run.sh --tag v2.9.1 \
+#   ./run.sh --version v0 \
+#            --tag v2.9.1 \
 #            --package_name mypkg \
 #            --author_name  "Max Mustermann" \
 #            --author_email max@example.com \
@@ -28,6 +29,7 @@ set -euo pipefail
 REPO_URL="https://git.0xmax42.io/actions/deb-changelog-action"
 
 # ───────────────────────────────────────────────
+VERSION=""
 TAG=""
 PACKAGE_NAME=""
 AUTHOR_NAME=""
@@ -41,6 +43,7 @@ show_help() { sed -n '2,25p' "$0"; }
 # 1 ─ Parse CLI options ─────────────────────────
 while [[ $# -gt 0 ]]; do
   case "$1" in
+    --version)       VERSION="$2";       shift 2 ;;
     --tag)           TAG="$2";           shift 2 ;;
     --package_name)  PACKAGE_NAME="$2";  shift 2 ;;
     --author_name)   AUTHOR_NAME="$2";   shift 2 ;;
@@ -53,6 +56,7 @@ while [[ $# -gt 0 ]]; do
 done
 
 # 2 ─ Validate mandatory inputs ────────────────
+[[ -z "$VERSION"       ]] && { echo "❌ --version is required";       exit 1; }
 [[ -z "$TAG"           ]] && { echo "❌ --tag is required";           exit 1; }
 [[ -z "$PACKAGE_NAME"  ]] && { echo "❌ --package_name is required";  exit 1; }
 [[ -z "$AUTHOR_NAME"   ]] && { echo "❌ --author_name is required";   exit 1; }
@@ -62,8 +66,8 @@ done
 TMP_DIR=$(mktemp -d)
 trap 'rm -rf "$TMP_DIR"' EXIT
 
-echo "📥 Cloning ${REPO_URL}@${TAG} → $TMP_DIR"
-git clone --depth 1 --branch "$TAG" "$REPO_URL" "$TMP_DIR" >/dev/null
+echo "📥 Cloning ${REPO_URL}@${VERSION} → $TMP_DIR"
+git clone --depth 1 --branch "$VERSION" "$REPO_URL" "$TMP_DIR" >/dev/null
 
 # 4 ─ Install git-cliff via helper script ──────
 bash "$TMP_DIR/scripts/install-git-cliff.sh"