FROM rust
WORKDIR /app

# copying just cargo config and making a stub main 
# this means docker can cache building deps
# and just build the main program in watch mode
# much quicker and nicer on my cpu, network, and ram lol
COPY ./Cargo.toml ./Cargo.toml
COPY ./Cargo.lock ./Cargo.lock
RUN mkdir ./src && echo 'fn main() { println!("Using cache build!!"); loop { println!("DOCKERFILE failed..."); } }' > ./src/main.rs
RUN cargo build --locked
RUN rm -f ./target/debug/index

COPY ./src ./src
COPY ./.sqlx ./.sqlx
RUN cargo build --locked

RUN cp ./target/debug/index ./index
CMD ["/app/index"]