add a Dockerfile for a swarm image

swarm/Dockerfile

@@ -0,0 +1,32 @@
+FROM alpine:3.8 as builder
+
+ENV GOLANG_VERSION=1.10.3
+ENV ETHEREUM_REPO=https://github.com/ethereum/go-ethereum
+
+# Deps
+RUN apk add --no-cache git make go linux-headers gcc musl-dev 
+ENV GOPATH=/go/
+
+RUN mkdir -p "${GOPATH}/src/github.com/ethereum" && \
+    git clone "$ETHEREUM_REPO" "${GOPATH}/src/github.com/ethereum/go-ethereum"
+
+WORKDIR "${GOPATH}/src/github.com/ethereum/go-ethereum"
+
+RUN go get github.com/ethereum/go-ethereum
+RUN go install ./cmd/geth
+RUN go install ./cmd/swarm
+
+# Copy the binary to the second image
+FROM alpine:latest
+
+LABEL source="https://github.com/status-im/infra-utils"
+LABEL description="Swarm docker image created for Status.im"
+LABEL maintainer="support@status.im"
+
+COPY --from=builder /go/bin/geth /bin/geth
+COPY --from=builder /go/bin/swarm /bin/swarm
+
+ENTRYPOINT ["/bin/swarm"]
+CMD ["--help"]
+
+EXPOSE 30399