Switch to up-to-date Debian

Remove `curl apt-transport-https ca-certificates` installation

most likely used to install `docker-engine` from Docker apt repo

remove `docker-compose` installation, I don’t see a usage

Dockerfile

-FROM library/ubuntu:16.04
-MAINTAINER Florian Thöni <florian.thoni@floth.fr>
+FROM debian:bookworm-slim
 
-ENV DEBIAN_FRONTEND noninteractive
-
-RUN apt-get update; \
-   apt-get install -y curl apt-transport-https ca-certificates; \
-   apt-get update; \
-   apt-get install -y docker docker-compose git; \
-   apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+RUN apt update && \
+   apt install --yes docker git && \
+   rm -rf /var/lib/apt/lists/*