Update Dockerfile

Dockerfile

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+# Simple usage with a mounted data directory:
+# > docker build -t onex .
+# > docker run -it -v ~/.onex:/onex/.onex onomy/onex-dev init onex --home /onex/.onex
+# Copy genesis.json from dev/config to ~/.onex/config and Dealer and Validator keys are in dev/config
+# > docker run -it -v ~/.onex:/onex/.onex onomy/onex-dev keys add dealer --recover --home /onex/.onex
+# > docker run -it -v ~/.onex:/onex/.onex onomy/onex-dev keys add validator --recover --home /onex/.onex
+# > docker run -it -v ~/.onex:/onex/.onex onomy/onex-dev gentx validator 10000000000000000000stake --chain-id onex --home /onex/.onex
+# > docker run -it -v ~/.onex:/onex/.onex onomy/onex-dev collect-gentxs --home /onex/.onex
+# > docker run -it -p 26656:26656 -p 26657:26657 -p 1317:1317 -p 9090:9090 -p 9091:9091 -d -v ~/.onex:/onex/.onex onomy/onex-dev start --home /onex/.onex
+FROM golang:alpine AS build-env
+
+# Set up dependencies
+ENV PACKAGES curl make git libc-dev bash gcc linux-headers eudev-dev python3
+
+# Set working directory for the build
+WORKDIR /go/src/github.com/onomyprotocol/onex
+
+# Add source files
+COPY . .
+RUN pwd
+RUN ls
+
+RUN go version
+
+# Install minimum necessary dependencies, build Cosmos SDK, remove packages
+RUN apk add --no-cache $PACKAGES
+RUN make install
+
+# Final image
+FROM alpine:edge
+
+ENV onex /onex
+
+# Install ca-certificates
+RUN apk add --update ca-certificates
+
+WORKDIR $onex
+
+# Copy over binaries from the build-env
+COPY --from=build-env /go/bin/onexd /usr/bin/onexd
+
+EXPOSE 26656
+EXPOSE 26657
+EXPOSE 1317
+EXPOSE 9090
+EXPOSE 9091
+
+# Run onexd by default, omit entrypoint to ease using container with onexcli
+ENTRYPOINT ["onexd"]