Optimised dockerfile for slightly smaller build image. It is still qu…

…ite large due to rust cache

Dockerfile

@@ -1,19 +1,31 @@
 # syntax=docker/dockerfile:1
 
+# Use a multi-stage build to compile the application
+FROM rust:alpine as builder
+
+WORKDIR /usr/src/fendermint
+# Install dependencies required for the build
+RUN apk add --no-cache clang musl-dev git curl jq bash \
+    && git clone https://github.com/consensus-shipyard/fendermint.git . \
+    && cargo install --force cargo-make
+
+
+# Start with a new, clean base image to reduce size
 FROM docker:cli
 
-RUN apk add --no-cache clang musl-dev git curl jq bash
+RUN apk add --no-cache bash jq curl libgcc
 
-WORKDIR /app
+# Copy only the compiled binaries and any other necessary files from the builder image
+COPY --from=builder /usr/local/cargo/bin /usr/local/cargo/bin
+COPY --from=builder /usr/src/fendermint /app/fendermint
 
-COPY . .
+# Set any environment variables needed
+ENV PATH="/usr/local/cargo/bin:${PATH}"
 
-RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
-ENV PATH="/root/.cargo/bin:${PATH}"
-RUN cargo install --force cargo-make
+# Set the work directory
+WORKDIR /app
 
-RUN git clone https://github.com/consensus-shipyard/fendermint.git && \
-  cd fendermint && \
-  cargo make --makefile ./infra/Makefile.toml info
+RUN cd fendermint && cargo make --makefile ./infra/Makefile.toml info
 
-ENTRYPOINT ["/bin/bash", "-c"]
+# Set the entrypoint
+ENTRYPOINT ["/bin/bash", "-c"]