Docker image for gateway

docker/gateway/Dockerfile

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+FROM rust:1.56.1 as builder
+
+ARG NYM_VERSION="develop"
+RUN git clone https://github.com/nymtech/nym.git && cd nym && git checkout $NYM_VERSION
+RUN cargo install --path /nym/gateway
+
+FROM debian:buster-slim
+RUN apt-get update && apt-get install -y openssl ca-certificates && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /usr/local/cargo/bin/nym-gateway /usr/local/bin/nym-gateway
+ENTRYPOINT ["nym-gateway"]

docker/mixnode/Dockerfile

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+FROM rust:1.56.1 as builder
+
+ARG NYM_VERSION="develop"
+RUN git clone https://github.com/nymtech/nym.git && cd nym && git checkout $NYM_VERSION
+RUN cargo install --path /nym/mixnode
+
+FROM debian:buster-slim
+RUN apt-get update && apt-get install -y openssl ca-certificates && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /usr/local/cargo/bin/nym-mixnode /usr/local/bin/nym-mixnode
+ENTRYPOINT ["nym-mixnode"]