Switch to building with Depot

Change-Id: I4547e671e11f76e6776192cc68040d5e2ff61be9
(cherry picked from commit 564caa8bd7f1cf771958a97b8fff7c9bef90e447)
diff --git a/images/keepalived/Dockerfile b/images/keepalived/Dockerfile
index 37202c8..5b8ca51 100644
--- a/images/keepalived/Dockerfile
+++ b/images/keepalived/Dockerfile
@@ -1,10 +1,8 @@
-# SPDX-License-Identifier: Apache-2.0
-# Atmosphere-Rebuild-Time: 2024-06-28T12:14:26Z
+# SPDX-FileCopyrightText: © 2025 VEXXHOST, Inc.
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Atmosphere-Rebuild-Time: 2024-06-26T17:38:39Z
 
-ARG REGISTRY
-ARG RELEASE
-
-FROM ${REGISTRY}/ubuntu:${RELEASE}
+FROM ubuntu
 RUN <<EOF bash -xe
 apt-get update -qq
 apt-get install -qq -y --no-install-recommends \