Dockerfile.alpine

# supported versions here: https://hub.docker.com/_/rust
ARG ALPINE_VERSION=3.20

########################
## builder image
########################
FROM rust:alpine${ALPINE_VERSION} AS builder

RUN apk add --no-cache musl-dev

WORKDIR /redlib

# download (most) dependencies in their own layer
COPY Cargo.lock Cargo.toml ./
RUN mkdir src && echo "fn main() { panic!(\"why am i running?\") }" > src/main.rs
RUN cargo build --release --locked --bin redlib
RUN rm ./src/main.rs && rmdir ./src

# copy the source and build the redlib binary
COPY . ./
RUN cargo build --release --locked --bin redlib
RUN echo "finished building redlib!"

########################
## release image
########################
FROM alpine:${ALPINE_VERSION} AS release

# Import redlib binary from builder
COPY --from=builder /redlib/target/release/redlib /usr/local/bin/redlib

# Add non-root user for running redlib
RUN adduser --home /nonexistent --no-create-home --disabled-password redlib
USER redlib

# Document that we intend to expose port 8080 to whoever runs the container
EXPOSE 8080

# Run a healthcheck every minute to make sure redlib is functional
HEALTHCHECK --interval=1m --timeout=3s CMD wget --spider --q http://localhost:8080/settings || exit 1

# Add container metadata
LABEL org.opencontainers.image.authors="sigaloid"

CMD ["redlib"]