DockerHub support (#2325)

Dockerfile

@@ -3,8 +3,9 @@ FROM golang:1.16-alpine3.13 as builder
 RUN apk --no-cache add make gcc g++ linux-headers git bash ca-certificates libgcc libstdc++
 
 WORKDIR /app
+ADD . .
 
-RUN make erigon rpcdaemon integration sentry
+RUN make all
 
 FROM alpine:3.13
 

hooks/post_checkout

+#!/bin/bash
+# Docker hub does a recursive clone, then checks the branch out,
+# so when a PR adds a submodule (or updates it), it fails.
+git submodule update --init