Rust webapp dockerization template for static binary with musl libc

Dockerfile

FROM rust:latest as builder

RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        musl-tools

RUN rustup target add x86_64-unknown-linux-musl
RUN rustup component add clippy

WORKDIR /x

## doing some overhead here to keep docker build time low
# create a new empty shell project
RUN USER=root cargo new --bin server
WORKDIR /x/server

# copy over your manifests
COPY ./server/Cargo.lock ./
COPY ./server/Cargo.toml ./

# this build step will cache dependencies
RUN RUSTFLAGS=-Clinker=musl-gcc cargo build --target x86_64-unknown-linux-musl --release
RUN rm src/*.rs
## done with the overhead

# skip all other waste
COPY ./server/src ./src
RUN rm -f ./target/release/deps/server*
RUN RUSTFLAGS=-Clinker=musl-gcc \
    cargo clippy --target x86_64-unknown-linux-musl --all-features -- -D warnings && \
    cargo test --target x86_64-unknown-linux-musl --verbose && \
    cargo build --target x86_64-unknown-linux-musl --release --verbose

# take the build artifact
FROM scratch

WORKDIR /x

COPY --from=builder /x/server/target/x86_64-unknown-linux-musl/release/server /x/server

USER 1000
EXPOSE 9090
CMD ["/x/server"]