dev: add ability to pass --docker, --podman, or --native to update.sh

passing more than one of these flags is not expected

update.sh

@@ -69,25 +69,35 @@ for message in $(find neko/messages -type f ! -name '*.resolved' -print | sort);
   fi
 done
 
+docker_update() {
+  ./neko/update/container.sh 'docker' "$@"
+}
+podman_update() {
+  ./neko/update/container.sh 'podman' "$@"
+}
+native_update() {
+  ./neko/update/native.sh "$@"
+}
+
+if   contains '--docker' "$@"; then docker_update "$@"
+elif contains '--podman' "$@"; then podman_update "$@"
+elif contains '--native' "$@"; then native_update "$@"
+
+else
   say 'Do you use Docker or Podman?'
   printf 'd: Docker, p: Podman, n: No [d/p/N] > '
   read -r resp
 
   case "${resp}" in
-  [Dd])
-    ./neko/update/docker.sh 'docker' "$@"
-    ;;
-  [Pp])
-    ./neko/update/docker.sh 'podman' "$@"
-    ;;
     [Yy]|[Yy][Ee][Ss])
       sadsay "Watch out! ${resp} is not a valid answer." >&2
       exit 1
       ;;
-  *)
-    ./neko/update/native.sh "$@"
-    ;;
+    [Dd]) docker_update "$@" ;;
+    [Pp]) podman_update "$@" ;;
+    *)    native_update "$@" ;;
   esac
+fi
 
 # Done
 say 'Enjoy your sabakan life~'