ARG ALPINE_VERSION=latest
FROM alpine:$ALPINE_VERSION as builder

COPY Cargo.lock /usr/src/
COPY Cargo.toml /usr/src/
COPY src/ /usr/src/src/

WORKDIR /usr/src

RUN apk add --no-cache rustup build-base && \
    rustup-init -qy --profile=minimal --default-toolchain=$RUST_VERSION && \
    source "$HOME/.cargo/env" && \
    mkdir src && echo "fn main() {}" > src/main.rs && \
    cargo fetch && \
    cargo build --release --target=x86_64-unknown-linux-musl && \
    rm src/main.rs

COPY src/ /usr/src/src/

RUN source "$HOME/.cargo/env" && \
    touch src/main.rs && \
    cargo build --release --target=x86_64-unknown-linux-musl

FROM alpine:$ALPINE_VERSION

COPY --from=builder /usr/src/target/x86_64-unknown-linux-musl/release/web-template /usr/bin/

CMD [ "/usr/bin/web-template" ]