[FEATURE] Switch to alpine

and build join-networks in pre stage

Author: mickaelperrin

.gitmodules

@@ -1,15 +1,22 @@
-FROM jwilder/nginx-proxy:latest
+FROM golang:1.8 as builder
+WORKDIR /go/src/github.com/codekitchen/dinghy-http-proxy
+COPY join-networks.go .
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go get -v github.com/fsouza/go-dockerclient
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -v -o join-networks
+
+FROM jwilder/nginx-proxy:alpine
 MAINTAINER Brian Palmer <[email protected]>
 
-RUN apt-get update \
- && apt-get install -y -q --no-install-recommends \
-    dnsmasq \
- && apt-get clean \
- && rm -r /var/lib/apt/lists/*
+RUN apk upgrade --no-cache \
+ && apk add --no-cache --virtual=run-deps \
+      su-exec \
+      curl \
+      dnsmasq \
+ && rm -rf /tmp/* \
+      /var/cache/apk/* \
+      /var/tmp/*
 
-RUN wget https://github.com/codekitchen/dinghy-http-proxy/releases/download/join-networks-v3/join-networks.tar.gz \
- && tar -C /app -xzvf join-networks.tar.gz \
- && rm join-networks.tar.gz
+COPY --from=builder /go/src/github.com/codekitchen/dinghy-http-proxy/join-networks /app/join-networks
 
 COPY Procfile /app/