docker: slimmer system update

docker/Dockerfile

@@ -1,9 +1,8 @@
 FROM debian:12.7-slim
 
-# Install required packages TODO combine with next run, so the rm affects this one as well
-RUN apt-get update && apt-get upgrade --yes
-
-RUN DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends \
+# Install required packages
+RUN dpkg-reconfigure debconf --frontend=noninteractive && apt-get update && apt-get upgrade --yes && \
+    apt-get install --yes --no-install-recommends \
     git \
     ssh \
     make \