zero2prod on arm

Dockerfile

FROM rust:latest as chef
WORKDIR /app

RUN apt update && apt upgrade -y
RUN apt install -y g++-arm-linux-gnueabihf libc6-dev-armhf-cross

RUN rustup target add armv7-unknown-linux-gnueabihf

RUN cargo install cargo-chef

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

ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc CC_armv7_unknown_Linux_gnueabihf=arm-linux-gnueabihf-gcc CXX_armv7_unknown_linux_gnueabihf=arm-linux-gnueabihf-g++
RUN cargo chef cook --release --target armv7-unknown-linux-gnueabihf --recipe-path recipe.json
COPY . .

ENV SQLX_OFFLINE true
RUN cargo build --target armv7-unknown-linux-gnueabihf --release --bin zero2prod

# Runtime stage
FROM --platform=linux/arm/v7 debian:bullseye-slim AS runtime

WORKDIR /app

RUN apt-get update -y \
    && apt-get install -y --no-install-recommends openssl ca-certificates \
    # Clean up
    && apt-get autoremove -y \
    && apt-get clean -y \
    && rm -rf /var/lib/apt/lists/*

COPY --from=builder /app/target/armv7-unknown-linux-gnueabihf/release/zero2prod zero2prod
COPY configuration configuration
ENV APP_ENVIRONMENT production
ENTRYPOINT ["./zero2prod"]

Need to run docker run --privileged --rm tonistiigi/binfmt --install all
before the build, as per doc : https://docs.docker.com/build/building/multi-platform/
The runtime stage running on linux/arm/v7 platform