# Build stage
FROM rust:1.93-alpine AS builder
RUN apk add --no-cache musl-dev binutils
WORKDIR /app
# Copy manifests first for layer caching
COPY Cargo.toml Cargo.lock ./
COPY test_support/Cargo.toml test_support/
# Create dummy files to build dependencies
RUN mkdir -p src test_support/src && \
printf "//! Build stub for dependency caching.\\nfn main() {}\\n" > src/main.rs && \
printf "" > test_support/src/lib.rs && \
cargo build --release && \
rm -rf src test_support/src
# Copy actual source code
COPY src/ src/
COPY test_support/src/ test_support/src/
# Build the application
RUN cargo build --release && strip /app/target/release/elektromail
# Runtime stage - Alpine for DNS + TLS + tzdata
FROM alpine:3.21
RUN apk add --no-cache ca-certificates tzdata \
&& adduser -D -H elektromail
COPY --from=builder /app/target/release/elektromail /usr/local/bin/
# Default ports: SMTP 2525, IMAP 1143
EXPOSE 2525 1143
USER elektromail
ENTRYPOINT ["elektromail"]