Dockerfile

# We use cargo-chef which builds dependences in a separate layer before building application code. This speeds up builds by a lot.
FROM lukemathwalker/cargo-chef:latest-rust-1.91 AS chef
WORKDIR /app

FROM chef AS planner
COPY . .
RUN cargo chef prepare --recipe-path recipe.json

FROM chef AS builder
COPY --from=planner /app/recipe.json recipe.json
# Build dependencies - this is the caching Docker layer!
RUN cargo chef cook --release --recipe-path recipe.json
# Build application
COPY . .
RUN cargo build --release --bin palsbot

# We do not need the Rust toolchain to run the binary!
FROM debian:bookworm-slim AS runtime
RUN apt-get update
RUN apt-get install -y openssl ca-certificates
WORKDIR /app
COPY --from=builder /app/target/release/palsbot /usr/local/bin
# COPY config.json5 config.json5 # instead of building config into container, we will add before running with `docker cp`
ENTRYPOINT ["/usr/local/bin/palsbot"]