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Dockerfile
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FROM --platform=$BUILDPLATFORM rust:1.82.0@sha256:33a0ea4769482be860174e1139c457bdcb2a236a988580a28c3a48824cbc17d6 AS builder
ARG TARGET=x86_64-unknown-linux-musl
ARG APPLICATION_NAME
RUN rustup target add ${TARGET}
RUN rm -f /etc/apt/apt.conf.d/docker-clean; echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache
# borrowed (Ba Dum Tss!) from
# https://github.com/pablodeymo/rust-musl-builder/blob/7a7ea3e909b1ef00c177d9eeac32d8c9d7d6a08c/Dockerfile#L48-L49
RUN --mount=type=cache,target=/var/cache/apt --mount=type=cache,target=/var/lib/apt \
dpkg --add-architecture arm64 && \
apt-get update && \
apt-get --no-install-recommends install -y \
build-essential \
musl-dev \
musl-tools \
libc6-dev-arm64-cross \
gcc-aarch64-linux-gnu
# The following block
# creates an empty app, and we copy in Cargo.toml and Cargo.lock as they represent our dependencies
# This allows us to copy in the source in a different layer which in turn allows us to leverage Docker's layer caching
# That means that if our dependencies don't change rebuilding is much faster
WORKDIR /build
RUN cargo new ${APPLICATION_NAME}
WORKDIR /build/${APPLICATION_NAME}
COPY .cargo ./.cargo
COPY Cargo.toml Cargo.lock ./
RUN --mount=type=cache,id=cargo-dependencies,target=/build/${APPLICATION_NAME}/target \
cargo build --release --target ${TARGET}
# now we copy in the source which is more prone to changes and build it
COPY src ./src
# --release not needed, it is implied with install
RUN --mount=type=cache,id=full-build,target=/build/${APPLICATION_NAME}/target \
cargo install --path . --target ${TARGET} --root /output
FROM alpine:3.20.3@sha256:beefdbd8a1da6d2915566fde36db9db0b524eb737fc57cd1367effd16dc0d06d
ARG APPLICATION_NAME
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
USER appuser
WORKDIR /app
COPY --from=builder /output/bin/${APPLICATION_NAME} /app/entrypoint
ENV RUST_BACKTRACE=full
ENTRYPOINT ["/app/entrypoint"]