diff --git a/.container b/.container
new file mode 100644
index 0000000..1562522
--- /dev/null
+++ b/.container
@@ -0,0 +1 @@
+ghcr.io/gardenlinux/repo-debian-snapshot@sha256:4b8f25a88bc5585fb41d79320249c8a0f341d4ecb9a3cd154a8b374944945153
diff --git a/prepare_source b/prepare_source
index 4ffc1c2..166ffbc 100644
--- a/prepare_source
+++ b/prepare_source
@@ -1,2 +1,3 @@
 apt_src refpolicy
 apply_patches
+version_suffix=gardenlinux0