add Dockerfile for building rapidsnark

Dockerfile

@@ -0,0 +1,20 @@
+# syntax=docker/dockerfile:experimental
+
+FROM node:lts-bullseye-slim AS builder
+ARG BUILDARGS
+ARG TARGET=x86_64
+ARG GMP_TARGET=host
+WORKDIR /src
+COPY . .
+
+RUN apt update && \
+	apt install -y curl build-essential cmake git nasm m4 && \
+	git submodule init && git submodule update && \
+	./build_gmp.sh $GMP_TARGET
+
+RUN mkdir build_prover && \
+	cd build_prover && \
+	cmake .. -DTARGET_PLATFORM=$TARGET -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../package && \
+	make -j2 && make install
+
+ENTRYPOINT ["/bin/bash"]

README.md

@@ -95,6 +95,24 @@ cmake .. -GXcode -DTARGET_PLATFORM=IOS -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTAL
 Open generated Xcode project and compile prover.
 
 
+## Using Docker
+
+You might use the Dockerfile avialable on this repository for setting up the build environment and perform the compilation.
+
+To create the docker image, execute:
+
+`docker image build -t rapidsnark .`
+
+The image compiles rapidsnark and libgpm for host x86_64.
+
+You can create a new container and access to bash (source code available in /src directory).
+
+`docker run -it rapidsnark`
+
+Then you can extract the compiled files by executing the following docker command:
+
+`docker cp <container_id>:/src/package rapidsnark_package`
+
 ## Building proof
 
 You have a full prover compiled in the build directory.