Complete Chapter 5

+ Add in More CI/CD
+ Update Tests and Configurations

Dockerfile

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+##### Chef
+FROM lukemathwalker/cargo-chef:latest-rust-1.76.0 as chef
+WORKDIR /app
+RUN apt update && apt install lld clang -y
+
+##### Planner
+FROM chef as planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+##### Builder
+# Builder prepares project dependancies, not the application.
+FROM chef as builder
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json
+COPY . .
+ENV SQLX_OFFLINE true
+# Now build the application itself.
+RUN cargo build --release --bin mail_app
+
+##### Runtime
+FROM debian:bookworm-slim as runtime
+
+WORKDIR /app
+RUN apt update && apt install -y --no-install-recommends openssl ca-certificates \
+    && apt autoremove -y \
+    && apt clean -y \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /app/target/release/mail_app mail_app
+COPY configuration  configuration
+ENV APP_ENVIRONMENT production
+ENTRYPOINT ["./mail_app"]