Rust performant cross-architecture Dockerfile

Dockerfile

# Replace all <____> placeholders with values matching your project
FROM --platform=$BUILDPLATFORM rust:<version>-alpine AS builder
# This will be set automatically by docker buildx
ARG TARGETPLATFORM

WORKDIR /app
# Add any system dependencies here
RUN apk update && apk add --no-cache protobuf-dev postgresql-dev
# Map $TARGETPLATFORM to $RUST_TARGET used by cargo. Add any other desired architectures
RUN case "${TARGETPLATFORM}" in \
    "linux/amd64") export RUST_TARGET="x86_64-unknown-linux-musl";; \
    "linux/arm64") export RUST_TARGET="aarch64-unknown-linux-musl";; \
    *) echo "Unsupported TARGETPLATFORM ${TARGETPLATFORM}"; exit 1;; \
    esac && \
    rustup target add $RUST_TARGET
ENV CARGO_TARGET_DIR=/app/target

COPY Cargo.toml Cargo.lock build.rs ./
COPY ./protos/ ./protos/
# Simulate src folder to install dependencies & run build script. This optimizes built times on cache misses
RUN mkdir src && echo "fn main() {}" > src/main.rs && cargo build --release && rm -rf src

COPY src ./src
RUN cargo build --release
RUN strip ./target/release/<binary_name>

FROM alpine:latest
WORKDIR /app

EXPOSE <app_ports>

COPY --from=builder /app/target/release/<binary_name> ./<binary_name>
ENTRYPOINT ["./<binary_name>"]