optimize build

Dockerfile

@@ -1,18 +1,47 @@
-FROM rust:1.65.0-bullseye AS builder
-ARG SERVICE
+# Step -1: Grab mold
+FROM debian:bullseye as mold
+RUN apt-get update && apt-get install -y curl
+ARG MOLD_VERSION=1.7.1
+RUN curl -sSL https://github.com/rui314/mold/releases/download/v${MOLD_VERSION}/mold-${MOLD_VERSION}-x86_64-linux.tar.gz | tar xzv && \
+    mv mold-${MOLD_VERSION}-x86_64-linux/bin/mold /mold && \
+    rm -rf mold-${MOLD_VERSION}-x86_64-linux
 
+# Step 1: Compute a recipe file
+FROM rust as planner
 WORKDIR /app
-COPY Cargo.toml Cargo.lock ./
-COPY services ./services
-COPY hack ./hack
+RUN cargo install cargo-chef
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
 
-RUN cargo build --bin ${SERVICE} --release
+# Step 2: Cache project dependencies
+FROM rust as cacher
+WORKDIR /app
+RUN cargo install cargo-chef
+RUN apt-get update && apt-get install -y --no-install-recommends clang
+COPY --from=mold /mold /mold
+COPY --from=planner /app/recipe.json recipe.json
+ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
+ENV RUSTFLAGS="-C link-arg=-fuse-ld=/mold"
+RUN cargo chef cook --release --recipe-path recipe.json
 
-
-FROM debian:bullseye-slim AS target
+# Step 3: Build the binary
+FROM rust as builder
+WORKDIR /app
+RUN apt-get update && apt-get install -y --no-install-recommends clang
+COPY . .
+# Copy over the cached dependencies from above
+COPY --from=cacher /app/target target
+COPY --from=mold /mold /mold
+COPY --from=cacher /usr/local/cargo /usr/local/cargo
+ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
+ENV RUSTFLAGS="-C link-arg=-fuse-ld=/mold"
 ARG SERVICE
-RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
-COPY --from=builder /app/target/release/${SERVICE} /app
+RUN cargo build --release --bin ${SERVICE}
 
-RUN chmod a+x /app
-CMD /app
+# Step 4:
+# Create a tiny output image.
+# It only contains our final binary.
+FROM debian:bullseye-slim as runtime
+ARG SERVICE
+COPY --from=builder /app/target/release/${SERVICE} /app
+ENTRYPOINT ["/app"]