diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..6b8b91c
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM ubuntu:24.04
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends apt-mirror ca-certificates rsync && \
+    rm -rf /var/lib/apt/lists/*
+# mirror.list wird zur Build-Zeit reinkopiert, kann aber auch gemountet werden
+COPY mirror.list /etc/apt/mirror.list
+VOLUME ["/var/spool/apt-mirror"]
+# Einfache Endlosschleife: alle 12h synchronisieren
+CMD bash -c 'mkdir -p /var/spool/apt-mirror/var; \
+             echo "[$(date -Is)] initial sync..." >&2; \
+             apt-mirror || true; \
+             while true; do \
+               echo "[$(date -Is)] periodic sync..." >&2; \
+               apt-mirror || true; \
+               sleep 12h; \
+             done'
\ No newline at end of file