clients/go-ethereum: update Docker for building from source

clients/go-ethereum/Dockerfile

@@ -1,45 +1,40 @@
-# Docker container spec for building the master branch of go-ethereum.
-#
-# The build process it potentially longer running but every effort was made to
-# produce a very minimalistic container that can be reused many times without
-# needing to constantly rebuild.
+## By default, the geth is pulled from Docker Hub.
 
 ARG branch=latest
-FROM ethereum/client-go:$branch
+FROM ethereum/client-go:$branch as builder
 
-RUN apk add --update bash curl jq
+## ----
+## Uncomment the steps below (and comment out the steps above!) to build go-ethereum
+## from local sources in the ./go-ethereum directory.
 
-# FROM alpine:latest
+# FROM golang:1-alpine as builder
 # ARG branch=master
+# ADD go-ethereum /go-ethereum
+# WORKDIR /go-ethereum
+# RUN apk add --update bash curl jq git make
+# RUN make geth
+# RUN mv ./build/bin/geth /usr/local/bin/geth
 
-# Build go-ethereum on the fly and delete all build tools afterwards
-# RUN \
-#   apk add --update bash curl jq go git make gcc musl-dev              \
-#         ca-certificates linux-headers                           && \
-#   git clone --depth 1 --branch $branch  https://github.com/ethereum/go-ethereum && \
-#   (cd go-ethereum && make geth)                               && \
-#   (cd go-ethereum                                             && \
-#   echo "{}"                                                      \
-#   | jq ".+ {\"repo\":\"$(git config --get remote.origin.url)\"}" \
-#   | jq ".+ {\"branch\":\"$(git rev-parse --abbrev-ref HEAD)\"}"  \
-#   | jq ".+ {\"commit\":\"$(git rev-parse HEAD)\"}"               \
-#   > /version.json)                                            && \
-#   cp go-ethereum/build/bin/geth /geth                         && \
-#   apk del go git make gcc musl-dev linux-headers              && \
-#   rm -rf /go-ethereum && rm -rf /var/cache/apk/*
+## ----
 
+FROM alpine:latest
+RUN apk add --update bash jq
+COPY --from=builder /usr/local/bin/geth /usr/local/bin/geth
+
+# Generate the version.txt file.
 RUN /usr/local/bin/geth console --exec 'console.log(admin.nodeInfo.name)' --maxpeers=0 --nodiscover --dev 2>/dev/null | head -1 > /version.txt
 
-# Inject the startup script
+# Inject the startup script.
 ADD geth.sh /geth.sh
 ADD mapper.jq /mapper.jq
 RUN chmod +x /geth.sh
 
-# Inject the enode id retriever script
+# Inject the enode id retriever script.
 RUN mkdir /hive-bin
 ADD enode.sh /hive-bin/enode.sh
 RUN chmod +x /hive-bin/enode.sh
 
+# Add a default genesis file.
 ADD genesis.json /genesis.json
 
 # Export the usual networking ports to allow outside access to the node