Docker: adjust build and runtime container (closes #163)

Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.80.1-slim
+FROM rust:1.80.1-slim-bookworm
 ARG	DEBIAN_FRONTEND=noninteractive
 RUN	apt-get update && apt-get install -y --no-install-recommends --no-install-suggests ca-certificates pkg-config libssl-dev libpq-dev
 ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
@@ -12,7 +12,7 @@ COPY	Cargo.toml /lumen/
 RUN --mount=type=cache,target=$CARGO_HOME/registry,target=/lumen/target \
     cd /lumen && cargo build --release && cp /lumen/target/release/lumen /root/
 
-FROM	debian:buster-slim
+FROM	debian:bookworm-slim
 ARG	DEBIAN_FRONTEND=noninteractive
 RUN	apt-get update && apt-get install -y --no-install-recommends --no-install-suggests openssl libpq5 && \
     sed -i -e 's,\[ v3_req \],\[ v3_req \]\nextendedKeyUsage = serverAuth,' /etc/ssl/openssl.cnf
@@ -26,5 +26,4 @@ COPY	--from=0	/root/lumen	/usr/bin/lumen
 COPY	config-example.toml	docker-init.sh	/lumen/
 RUN	chmod a+x /lumen/docker-init.sh && chmod a+x /usr/bin/lumen
 WORKDIR	/lumen
-STOPSIGNAL SIGINT
 CMD /lumen/docker-init.sh