Dockerfile

FROM clux/muslrust:1.70.0 as builder
WORKDIR /app
ARG CARGO_BUILD_TARGET=x86_64-unknown-linux-musl

# comma-seperated list of features to enable
ARG CARGO_BUILD_FEATURES=default

# This can be set to release using --build-arg
ARG RUST_RELEASE_MODE="debug"

COPY . .

# Build the project
    
# Debug mode build
RUN --mount=type=cache,target=/app/target \
    if [ "$RUST_RELEASE_MODE" = "debug" ] ; then \
      echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs" \
      && cargo build --target ${CARGO_BUILD_TARGET} --features ${CARGO_BUILD_FEATURES} \
      && cp ./target/$CARGO_BUILD_TARGET/$RUST_RELEASE_MODE/lemmy_server /app/lemmy_server; \
    fi

# Release mode build
RUN \
    if [ "$RUST_RELEASE_MODE" = "release" ] ; then \
      echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs" \
      && cargo build --target ${CARGO_BUILD_TARGET} --features ${CARGO_BUILD_FEATURES} --release \
      && cp ./target/$CARGO_BUILD_TARGET/$RUST_RELEASE_MODE/lemmy_server /app/lemmy_server; \
    fi

# The alpine runner
FROM alpine:3 as lemmy

# Install libpq for postgres
RUN apk add --no-cache libpq

# Copy resources
COPY --from=builder /app/lemmy_server /app/lemmy

# Create non-privileged user
RUN adduser -h /app -s sh -S -u 1000 lemmy
RUN chown -R lemmy /app
USER lemmy

CMD ["/app/lemmy"]