Dockerfile

# syntax=docker/dockerfile:1
ARG RUST_VERSION=1.93.0
ARG APP_NAME=tau

FROM rust:${RUST_VERSION}-alpine AS build
ARG APP_NAME
WORKDIR /app

RUN apk add --no-cache clang lld musl-dev git curl

# Build the application.
# Leverage a cache mount to /usr/local/cargo/registry/
# for downloaded dependencies, a cache mount to /usr/local/cargo/git/db
# for git repository dependencies, and a cache mount to /app/target/ for
# compiled dependencies which will speed up subsequent builds.
# Leverage a bind mount to the src directory to avoid having to copy the
# source code into the container. Once built, copy the executable to an
# output directory before the cache mounted /app/target is unmounted.
RUN --mount=type=bind,source=src,target=src \
    --mount=type=bind,source=Cargo.toml,target=Cargo.toml \
    --mount=type=bind,source=Cargo.lock,target=Cargo.lock \
    --mount=type=bind,source=build.rs,target=build.rs \
    --mount=type=bind,source=.git,target=.git \
    --mount=type=bind,source=.sqlx,target=.sqlx \
    --mount=type=bind,source=migrations,target=migrations \
    --mount=type=cache,target=/app/target/ \
    --mount=type=cache,target=/usr/local/cargo/git/db \
    --mount=type=cache,target=/usr/local/cargo/registry/ \
    cargo build --locked --release && \
    cp ./target/release/$APP_NAME /bin/server

FROM alpine:3.18 AS final

# Create a non-privileged user that the app will run under.
# See https://docs.docker.com/go/dockerfile-user-best-practices/
ARG UID=10001
RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    appuser
USER appuser

COPY --from=build /bin/server /bin/

EXPOSE ${PORT}

CMD ["/bin/server"]