Updated and tested Dockerfile

Dockerfile

@@ -1,28 +1,31 @@
 # See https://github.com/LukeMathWalker/cargo-chef
-ARG RUST_VERSION=1-buster
-FROM rust:${RUST_VERSION} as planner
+ARG DEBIAN_RELEASE=bookworm
+ARG RUST_VERSION=1-${DEBIAN_RELEASE}
+FROM rust:${RUST_VERSION} AS planner
 WORKDIR /scryer-prolog
 RUN cargo install cargo-chef 
 COPY . .
 RUN cargo chef prepare --recipe-path recipe.json
 
-FROM rust:${RUST_VERSION} as cacher
+FROM rust:${RUST_VERSION} AS cacher
 WORKDIR /scryer-prolog
 RUN cargo install cargo-chef
 COPY --from=planner /scryer-prolog/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
 
-FROM rust:${RUST_VERSION} as builder
+FROM rust:${RUST_VERSION} AS builder
 WORKDIR /scryer-prolog
 COPY . .
 # Copy over the cached dependencies
 COPY --from=cacher /scryer-prolog/target target
 COPY --from=cacher $CARGO_HOME $CARGO_HOME
 RUN cargo build --release --bin scryer-prolog
 
-# Newer versions of Debian (i.e. bookworm) contain libssl3 instead of libssl1.1 
-# which we depend on.
-FROM debian:bullseye-slim
+FROM debian:${DEBIAN_RELEASE}-slim
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends openssl \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
 COPY --from=builder /scryer-prolog/target/release/scryer-prolog /usr/local/bin
 ENV RUST_BACKTRACE=1
 # Sanity check the binary: if it can't be executed (e.g. if there are missing libraries)